OPINION OF THE COURT
(April 7, 2014)
Cabret, Associate Justice.
Njeri Tutein appeals the Superior Court’s order granting sole physical custody of her son A.A. to his father, Juan Arteaga. We affirm because the Superior Court appropriately considered A.A.’s best interests in awarding custody to Arteaga.
I. FACTUAL AND PROCEDURAL BACKGROUND
Tutein and Arteaga are the unmarried biological parents of A.A. and his older brother A.M.A. In July 2011, Tutein took A.A. with her on a trip to St. Croix with the stated intention of returning to New York three weeks later. However, after arriving on St. Croix, Tutein registered A.A. in school and did not return to New York. In April 2012, Arteaga obtained a court order requiring A.A.’s return to New York, and subsequently travelled to St. Croix to retrieve A.A.
In response, Tutein went to New York and filed for custody of both A.A. and A.M.A. While Tutein eventually agreed to give Arteaga “full physical custody” of A.M.A., she refused to give up custody of A.A. The New York court dismissed Tutein’s petition, however, ruling that it lacked jurisdiction to determine A.A.’s custody because A.A. had been residing in St. Croix for at least six months prior to Tutein’s petition. Tutein then returned to St. Croix and petitioned the Superior Court for [713]*713custody of A.A., which ordered A.A.’s immediate return to St. Croix to remain in Tutein’s custody pending a custody hearing.
Between January and February 2013, the Superior Court ordered home studies for both Arteaga’s home in New York and Tutein’s St. Croix home. The Superior Court also appointed Pamela Colon, Esq., as guardian ad litem for A.A., ordering her “to preserve, protect, and defend [A.A.’s] interests.” Tutein v. Arteaga, Super. Ct. CS. No. 027/2012 (STX), slip op. at 1 (V.I. Super. Ct. Jan. 9, 2013). Specifically, the Superior Court ordered Colon to conduct an investigation, submit a written report of her findings, and make a recommendation on the disposition of A.A.’s custody. According to the Superior Court, it was necessary to appoint Colon because “Arteaga’s responsive pleading raised an allegation of an inappropriate sleeping arrangement involving A.A. while in the custody of [Tutein].”1 Colon then conducted a full investigation of the facts surrounding A.A.’s case and submitted a written report to the Superior Court before the custody hearing recommending that the Superior Court award custody to Arteaga.
At the custody hearing on May 14 and 15, 2013, the Superior Court heard testimony from A.A.’s school teacher on St. Croix, A.A.’s half-sisters I.S., I.D., and A.F. (and her boyfriend R.B.), as well as testimony from Tutein and Arteaga. In addition to the testimony of these witnesses, the Superior Court provided both parties with a copy of Colon’s report, and allowed the parties to cross-examine Colon about her role in the proceedings and the contents of her report. During closing arguments, Tutein unsuccessfully moved to strike Colon’s report on the grounds that it was inappropriate for the court to assign a guardian ad litem in a child custody case and that Colon’s role in the proceeding was impermissible. The Superior Court never ruled on Tutein’s motion to strike Colon’s report, and the hearing concluded on May 15,2013. On June 12,2013, the Superior Court determined that “it [was] in the best interest of . . . A.A.” to be with his father and awarded Arteaga sole custody. After a June 26, 2013 clarification order, Tutein filed a timely notice of appeal with this Court on July 15, 2013.
[714]*714II. JURISDICTION
We have jurisdiction over this appeal pursuant to V.I. CODE Ann. tit 4, § 32(a), which provides that “[t]he Supreme Court shall have jurisdiction over all appeals arising from final judgments, final decrees or final orders of the Superior Court.” An order granting custody of a minor to one parent is a final appealable order over which we may exercise jurisdiction. Madir v. Daniel, 53 V.I. 623, 630 (V.I. 2010).
HI. DISCUSSION
Tutein argues the Superior Court erred when it appointed a guardian ad litem in this custody dispute to investigate facts, issue a report, and make a recommendation regarding the custody of A. A., and insists that her right to procedural due process was violated by the ex parte submission of the guardian ad litem’s report to the Superior Court. Tutein also asserts that the Superior Court abused its discretion by failing to consider A.A.’s best interests when awarding custody.
A. The Superior Court’s Authority to Appoint a Guardian Ad Litem
Tutein contends that the Superior Court erred by invoking 16 V.I.C. § 142(a) to appoint Colon as A.A.’s guardian ad litem, arguing that the statute applies only in adoption proceedings. While we agree that section 142(a) does not provide for the appointment of a guardian ad litem in a custody dispute, this error was harmless because the Superior Court has the inherent authority — even in the absence of a statute — to appoint a guardian ad litem in a custody proceeding. We review the Superior Court’s conclusions of law, including its interpretation of a statute, de novo. V.I. Narcotics Strike Force v. Pub. Emp. Relations Bd., 60 V.I. 206, 212-213 (V.I. 2013). “The first step [in] interpreting a statute is to determine whether the language at issue has a plain and unambiguous meaning.” Kelley v. Gov’t of the V.I., 59 V.I. 742, 745 (V.I. 2013).
Section 142(a) provides that the Superior Court may, in certain circumstances, “appoint a suitable person to act. . . as guardian ad litem of the child” in adoption proceedings.2 Given the fact that section 142(a) [715]*715appears in chapter 5 of title 16 — governing adoptions — and specifically applies only to adoption proceedings, we agree with Tutein that the Superior Court erred in invoking section 142(a) to appoint Colon as guardian ad litem in this custody dispute. See Kelley, 59 V.I. at 745 (“If the statutory language is unambiguous and the statutory scheme is coherent and consistent, no further inquiry is needed.”). However, this Court will not reverse if the Superior Court’s error was harmless. V.I.S.Ct.R. 4(i). While the Virgin Islands Code authorizes the Superior Court to appoint a guardian ad litem for a minor in a variety of instances, no provision specifically authorizes the court to appoint a guardian ad litem in a custody proceeding. See, e.g., 15 V.I.C. §§ 821, 827 (addressing the appointment of a guardian ad litem in estate proceedings); 28 V.I.C. § 495 (governing the appointment of a guardian for minor shareholders in real property partition actions); 5 V.I.C. § 2505 (authorizing the Superior Court to appoint counsel as guardian ad litem for minors in abuse and neglect cases to act as an attorney for the child). Accordingly, we must determine whether, in the absence of an authorizing statute, the Superior Court had the common law authority to appoint a guardian ad litem in a custody proceeding.3
[716]*716This Court possesses the inherent and statutory authority to shape the common law of the Territory. Banks v. Int’l Rental & Leasing Corp., 55 V.I. 967, 974-80 (V.I. 2011).
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OPINION OF THE COURT
(April 7, 2014)
Cabret, Associate Justice.
Njeri Tutein appeals the Superior Court’s order granting sole physical custody of her son A.A. to his father, Juan Arteaga. We affirm because the Superior Court appropriately considered A.A.’s best interests in awarding custody to Arteaga.
I. FACTUAL AND PROCEDURAL BACKGROUND
Tutein and Arteaga are the unmarried biological parents of A.A. and his older brother A.M.A. In July 2011, Tutein took A.A. with her on a trip to St. Croix with the stated intention of returning to New York three weeks later. However, after arriving on St. Croix, Tutein registered A.A. in school and did not return to New York. In April 2012, Arteaga obtained a court order requiring A.A.’s return to New York, and subsequently travelled to St. Croix to retrieve A.A.
In response, Tutein went to New York and filed for custody of both A.A. and A.M.A. While Tutein eventually agreed to give Arteaga “full physical custody” of A.M.A., she refused to give up custody of A.A. The New York court dismissed Tutein’s petition, however, ruling that it lacked jurisdiction to determine A.A.’s custody because A.A. had been residing in St. Croix for at least six months prior to Tutein’s petition. Tutein then returned to St. Croix and petitioned the Superior Court for [713]*713custody of A.A., which ordered A.A.’s immediate return to St. Croix to remain in Tutein’s custody pending a custody hearing.
Between January and February 2013, the Superior Court ordered home studies for both Arteaga’s home in New York and Tutein’s St. Croix home. The Superior Court also appointed Pamela Colon, Esq., as guardian ad litem for A.A., ordering her “to preserve, protect, and defend [A.A.’s] interests.” Tutein v. Arteaga, Super. Ct. CS. No. 027/2012 (STX), slip op. at 1 (V.I. Super. Ct. Jan. 9, 2013). Specifically, the Superior Court ordered Colon to conduct an investigation, submit a written report of her findings, and make a recommendation on the disposition of A.A.’s custody. According to the Superior Court, it was necessary to appoint Colon because “Arteaga’s responsive pleading raised an allegation of an inappropriate sleeping arrangement involving A.A. while in the custody of [Tutein].”1 Colon then conducted a full investigation of the facts surrounding A.A.’s case and submitted a written report to the Superior Court before the custody hearing recommending that the Superior Court award custody to Arteaga.
At the custody hearing on May 14 and 15, 2013, the Superior Court heard testimony from A.A.’s school teacher on St. Croix, A.A.’s half-sisters I.S., I.D., and A.F. (and her boyfriend R.B.), as well as testimony from Tutein and Arteaga. In addition to the testimony of these witnesses, the Superior Court provided both parties with a copy of Colon’s report, and allowed the parties to cross-examine Colon about her role in the proceedings and the contents of her report. During closing arguments, Tutein unsuccessfully moved to strike Colon’s report on the grounds that it was inappropriate for the court to assign a guardian ad litem in a child custody case and that Colon’s role in the proceeding was impermissible. The Superior Court never ruled on Tutein’s motion to strike Colon’s report, and the hearing concluded on May 15,2013. On June 12,2013, the Superior Court determined that “it [was] in the best interest of . . . A.A.” to be with his father and awarded Arteaga sole custody. After a June 26, 2013 clarification order, Tutein filed a timely notice of appeal with this Court on July 15, 2013.
[714]*714II. JURISDICTION
We have jurisdiction over this appeal pursuant to V.I. CODE Ann. tit 4, § 32(a), which provides that “[t]he Supreme Court shall have jurisdiction over all appeals arising from final judgments, final decrees or final orders of the Superior Court.” An order granting custody of a minor to one parent is a final appealable order over which we may exercise jurisdiction. Madir v. Daniel, 53 V.I. 623, 630 (V.I. 2010).
HI. DISCUSSION
Tutein argues the Superior Court erred when it appointed a guardian ad litem in this custody dispute to investigate facts, issue a report, and make a recommendation regarding the custody of A. A., and insists that her right to procedural due process was violated by the ex parte submission of the guardian ad litem’s report to the Superior Court. Tutein also asserts that the Superior Court abused its discretion by failing to consider A.A.’s best interests when awarding custody.
A. The Superior Court’s Authority to Appoint a Guardian Ad Litem
Tutein contends that the Superior Court erred by invoking 16 V.I.C. § 142(a) to appoint Colon as A.A.’s guardian ad litem, arguing that the statute applies only in adoption proceedings. While we agree that section 142(a) does not provide for the appointment of a guardian ad litem in a custody dispute, this error was harmless because the Superior Court has the inherent authority — even in the absence of a statute — to appoint a guardian ad litem in a custody proceeding. We review the Superior Court’s conclusions of law, including its interpretation of a statute, de novo. V.I. Narcotics Strike Force v. Pub. Emp. Relations Bd., 60 V.I. 206, 212-213 (V.I. 2013). “The first step [in] interpreting a statute is to determine whether the language at issue has a plain and unambiguous meaning.” Kelley v. Gov’t of the V.I., 59 V.I. 742, 745 (V.I. 2013).
Section 142(a) provides that the Superior Court may, in certain circumstances, “appoint a suitable person to act. . . as guardian ad litem of the child” in adoption proceedings.2 Given the fact that section 142(a) [715]*715appears in chapter 5 of title 16 — governing adoptions — and specifically applies only to adoption proceedings, we agree with Tutein that the Superior Court erred in invoking section 142(a) to appoint Colon as guardian ad litem in this custody dispute. See Kelley, 59 V.I. at 745 (“If the statutory language is unambiguous and the statutory scheme is coherent and consistent, no further inquiry is needed.”). However, this Court will not reverse if the Superior Court’s error was harmless. V.I.S.Ct.R. 4(i). While the Virgin Islands Code authorizes the Superior Court to appoint a guardian ad litem for a minor in a variety of instances, no provision specifically authorizes the court to appoint a guardian ad litem in a custody proceeding. See, e.g., 15 V.I.C. §§ 821, 827 (addressing the appointment of a guardian ad litem in estate proceedings); 28 V.I.C. § 495 (governing the appointment of a guardian for minor shareholders in real property partition actions); 5 V.I.C. § 2505 (authorizing the Superior Court to appoint counsel as guardian ad litem for minors in abuse and neglect cases to act as an attorney for the child). Accordingly, we must determine whether, in the absence of an authorizing statute, the Superior Court had the common law authority to appoint a guardian ad litem in a custody proceeding.3
[716]*716This Court possesses the inherent and statutory authority to shape the common law of the Territory. Banks v. Int’l Rental & Leasing Corp., 55 V.I. 967, 974-80 (V.I. 2011). In determining an appropriate common law rule, we consider three non-dispositive factors: “(1) whether any Virgin Islands courts have previously adopted a particular rule; (2) the position taken by a majority of courts from other jurisdictions; and (3) most importantly, which approach represents the soundest rule for the Virgin Islands.” Simon v. Joseph, 59 V.I. 611, 623 (V.I. 2013) (citing Matthew v. Herman, 56 V.I. 674, 680-81 (V.I. 2012)).
Because there do not appear to be any previous cases in the Virgin Islands addressing this issue, we begin by considering how other jurisdictions address this issue at common law. Traditionally, the common law doctrine of parens patriae4 permitted family courts to act in the interest of a child whenever a legal proceeding implicated the child’s welfare. See Verrocchio v. Verrocchio, 16 Va. App. 314, 429 S.E.2d 482, 485 (1993). In such proceedings, family courts “exercise[d] and controlled]” the common law power of parens patriae, which is “separate and distinct from [a] purely statutory power” to protect the minor’s interest. Id. This power, in the absence of an authorizing statute, included “the long established practice of appointing a guardian ad litem [for] a child” in a custody proceeding. Id. When courts exercise their discretionary authority under the doctrine of parens patriae to appoint a guardian ad litem in a custody proceeding, the majority of jurisdictions to have considered the issue permit a guardian ad litem to serve “as an agent [717]*717or arm of the court . . . [who] essentially functions as the court’s investigative agent.” Clark v. Alexander, 953 P.2d 145, 153 (Wyo. 1998) (summarizing the “traditional role” of a guardian ad litem in custody proceedings).5 This role “predate[s] the enactment of . . . statutes,” and includes the duty to investigate facts surrounding a case, report findings to the court, and make a recommendation on the disposition of custody. McDonald v. McDonald, 39 So. 3d 868, 883 (Miss. 2010) (finding a state statute requiring a guardian ad litem to “investigate [and] make recommendations to the court... consistent with the traditional roles ... of a [guardian ad litem]”). The appointment of a guardian ad litem in a custody proceeding to function as an arm or agent of the court is also consistent with jurisdictions that specifically define the role of a guardian ad litem for certain types of proceedings, but lack a specific statutory definition for a court-appointed guardian ad litem in a custody dispute. See, e.g., Patel v. Patel, 347 S.C. 281, 555 S.E.2d 386, 389-90 (S.C. 2001) (absent a statutory directive, the role of the guardian ad litem in a custody dispute is to “conduct an . . . investigation [of] the facts relevant to the [718]*718situation of the child[,] ... mak[e] .. . recommendations ... and provide accurate, current information directly to the court[,] . . . and . . . present to the court.. . clear and comprehensive written reports ... regarding the child’s best interest”). Accordingly, it is clear that a majority of jurisdictions having addressed the issue agree that a court may appoint a guardian ad litem in a custody proceeding to perform the functions of investigating, reporting, and making recommendations to the court on the disposition of custody.
Most importantly, we conclude that recognizing the common law authority of the Superior Court to appoint a guardian ad litem in a custody dispute — even in the absence of statutory authority — is the sounder rule. As we noted in Madir, “it is clear that the Legislature intends for Virgin Islands courts ... to resolve custody disputes according to the best interests of the child.” Madir, 53 V.I. at 632. Failing to recognize the Superior Court’s authority to appoint a guardian ad litem in a custody dispute when the court concludes that the welfare of the child is in jeopardy would not serve the best interests of the child, and would therefore not be a sounder rule. In contrast, recognizing a court’s authority to appoint a guardian ad litem in a custody case ensures that the court will be able to make its decision based on complete, objective information that otherwise may have been unavailable to the court. Moreover, a guardian ad litem can serve as a buffer against the potentially biased interests of the parents and ensure that the child’s best interests receive the appropriate attention. Such a role is particularly helpful to a court when the parents have demonstrated a pattern of adversarial behavior or when there are concerns about whether all relevant information will be brought to the court’s attention. While at least one commentator has raised concerns regarding the use of guardians ad litem to perform investigatory functions in custody disputes6 — citing potential issues of fact suppression, bias, and value imposition — such concerns are outweighed by the benefits to minors who are often unable to protect themselves in the absence of a guardian who can assert their interests in court.
In light of these considerations, we hold that the Superior Court, independent of statutory authority and pursuant to its parens patriae [719]*719power, can appoint a guardian ad litem to (1) investigate the facts surrounding a custody dispute, (2) report those facts to the Superior Court, (3) testify at the hearing before the court, and (4) make a recommendation to the court on the disposition of custody whenever the welfare of the child is at issue. To avoid ambiguity, when appointing a guardian ad litem in a child custody proceeding, the appointing court should clearly specify the terms of the appointment, including the guardian’s role, duties, and scope of authority.
In this instance, the Superior Court did just that. After Arteaga “raised an allegation of an inappropriate sleeping arrangement involving A.A. while in the custody of [Tutein],” the Superior Court, presumably believing A.A.’s welfare to be at risk, appointed Colon to act as guardian ad litem. This appointment was within the Superior Court’s discretion to protect A.A.’s welfare, and the court properly noted the functions that Colon was to perform,7 expressly informing the parties that she would not assume the role of counsel for A.A., even though Colon is a licensed attorney in the Virgin Islands. In this capacity, Colon did not deviate from the role fashioned by the Superior Court and her report reflects that she remained true to her role as an arm and functionary of the Family Division in this proceeding. Accordingly, the scope of Colon’s participation as guardian ad litem was entirely proper and the Superior Court did not err in appointing Colon to investigate the facts of the case, issue a report, and make a recommendation on the disposition of custody.
Tutein also argues that Colon’s ex parte submission of evidence and her ex parte recommendation to the court denied Tutein procedural due process. We disagree. The Superior Court violates a [720]*720party’s procedural due process rights in a custody case by relying on a report submitted to the court ex parte where the preparer of the report is not present for cross-examination at the hearing. Dennie v. Swanston, 51 V.I. 163, 172 (V.I. 2009); accord Jacobsen v. Thomas, 323 Mont. 183, 100 P.3d 106, 111 (2004) (“[A] guardian ad litem must testify and be subject to cross examination if they give evidence concerning an investigation.”); see also Kelley v. Kelley, 2007 OK 100, 175 P.3d 400, 403 n.8 (Okla. 2007) (“[D]ue process requires that guardians ad litem must be available for cross-examination by parents where their recommendations will weigh in the trial court’s custody determination.”). In this case, the Superior Court provided a copy of the guardian ad litem’s report to both parties prior to the custody hearing and afforded each party the opportunity to cross-examine Colon on her observations. Moreover, in awarding custody to Arteaga, the Superior Court explicitly stated that it “base[d] its custody decision on the evidence of record ... rather than the Guardian Ad Litem’s report and testimony.” Accordingly, because both parties had the opportunity to cross-examine Colon regarding her recommendation and because the Superior Court did not exclusively rely on Colon’s report in awarding custody to Arteaga, Tutein was not deprived of her procedural due process rights.
B. The Superior Court’s Custody Award
Lastly, Tutein asserts that the Superior Court abused its discretion in awarding custody of A.A. to Arteaga because its decision was “arbitrary” and “made without . . . adequate consideration of the circumstances.”8 Because the Superior Court properly considered A.A.’s best interests in awarding custody to Arteaga, we disagree. On appeal, Tutein essentially asks this Court to reweigh the evidence, something an [721]*721appellate court will not do. Allen v. People, 59 V.I. 631 (V.I. 2013). Instead, we review the Superior Court’s award of child custody only for an abuse of discretion. Madir, 53 V.I. at 634. In applying this standard, we review the Superior Court’s legal holdings de novo and its findings of fact for clear error. Id. at 630. Under clear error review, we defer to the Superior Court “unless [its] determination either (1) is completely devoid of minimum evidentiary support displaying some hue of credibility, or (2) bears no rational relationship to the supportive evidentiary data.” Bradford v. Cramer, 54 V.I. 669, 673 (V.I. 2011) (quoting St. Thomas-St. John Bd. of Elections v. Daniel, 49 V.I. 322, 329 (V.I. 2007)).
In making its custody determination here, the Superior Court relied on this Court’s holding in Madir. In Madir, we concluded that the “best interests of the child should be the paramount concern” of the Superior Court in awarding custody. Madir, 53 V.I. at 632. We further declined to specifically define which factors the Superior Court must consider in determining the best interests of a child, but “encourage[d] judges to take account of all relevant considerations” in making their determination. Id. at 634. Nonetheless, despite declining in Madir to mandate a specific set of factors to govern every child custody award, our case law makes clear that when considering a custody dispute the Superior Court must (1) outline a set of relevant factors that it will use to determine the best interests of the child, id., and (2) explain how its findings of fact regarding those factors are supported by the evidence introduced at the hearing. Jung v. Ruiz, 59 V.I. 1050 (V.I. 2013) (indicating that the Superior Court’s factual findings must be adequately supported by the record); cf. In re Q.G., 60 V.I. 656, 662 (V.I. 2014) (“meaningful review [for abuse of discretion] is not possible where the trial court fails to sufficiently explain its reasoning”).
In this case, the Superior Court aptly enumerated the factors it considered to be relevant to A.A.’s best interests and expressly took those factors into account in considering the evidence and awarding custody to Arteaga. In particular, the Superior Court considered the following: (1) the parties’ respective home environments; (2) the ability of each parent to nurture the child; (3) whether either parent was guilty of abuse; (4) the interrelationship of the child to the parents, siblings, and family members; and (5) the willingness of each parent to provide a stable home environment for the child. These factors mirror the factors this Court approved of in Madir, but we note that “we are [in no] position as [722]*722an appellate court to mandate that all such factors, or even additional factors, must be considered in every case.” Madir, 53 V.I. at 634. Rather, this Court evaluates a Superior Court’s custody award to determine whether the court based its decision on relevant factors related to the best interests of the child. Because the Superior Court articulated factors that were clearly relevant and related to the best interests of A.A., we find that the court properly exercised its discretion.
To the extent that Tutein argues that the Superior Court’s findings of fact were clearly erroneous, we are not persuaded. The Superior Court’s factual findings were not “completely devoid of minimum evidentiary support” and did not lack a “rational relationship to the supportive evidentiary data.” Bradford, 54 V.I. at 673 (internal quotations marks omitted). To the contrary, the Superior Court’s factual findings were strongly tethered to the evidence introduced at the hearing. While the court determined that neither Tutein nor Arteaga were guilty of abuse and found both parents on equal footing with respect to the factors of home environment and ability to nurture, the court found that Arteaga was more able than Tutein to provide a stable home environment for A.A. On this factor, the court determined that while Arteaga “has consistently lived in New York” and is “currently employed,” Tutein remains unemployed and “has never been responsible for her own household.” The court’s finding that Arteaga was more capable than Tutein to provide a stable home environment for A.A. is supported by the record, which shows that Arteaga is the employed parent who has a demonstrated history of participation and presence in A.A.’s life, and has attended to most of A.A.’s medical, dietary, academic, and recreational needs. On the factor of the interrelationship of the child to parents and other siblings, the court found that A.A.’s bond with A.M.A. took “precedence over his bond with his maternal sisters.” The record strongly supports the court’s finding that A.A. and A.M.A should not be separated. At the custody hearing, Arteaga testified that A.A. looks up to A.M.A. as a role model. Furthermore, when Colon asked A.A. “where would you rather live, with your mother or your father?” A.A. responded that he “really miss[ed] his brother and want[ed] to live with [him].” Colon testified that A.A.’s statement deeply affected her, and that her investigation revealed that the brothers share a “deep affection for each other and desire to be together.” Tutein herself conceded that “it would be wonderful for [the boys] to be together,” and that A.A.’s separation from A.M.A. has caused A.A. much [723]*723difficulty. We therefore find no merit to Tutein’s argument that the Superior Court did not consider A.A.’s best interests, as the record clearly demonstrates otherwise.
IV. CONCLUSION
Although the Superior Court erred in invoking an adoption statute to appoint Colon as a guardian ad litem in this custody proceeding, the error was harmless because — even in the absence of statutory authority — the Superior Court has the common law authority to appoint a guardian ad litem in a custody dispute. In addition, because both parties had the opportunity to cross-examine Colon at the custody hearing regarding her report, Tutein was not denied procedural due process. Lastly, the Superior Court did not abuse its discretion in awarding custody of A. A. to Arteaga because the court properly considered A.A.’s best interests. Therefore, we affirm the Superior Court’s June 12, 2013 Order.