Gelinas, J.
R.S. (father), the former husband of M.P. (mother), appeals from a summary judgment of the Probate and Family Court dismissing his complaint for modification wherein he sought an increase in visitation with the two minor children of the parties’ marriage. As we conclude that there are factual is[799]*799sues in the case that require further exploration, we vacate the judgment and remand the matter to the Probate and Family Court for further proceedings consistent with this opinion.
The summary judgment materials reflect the following. Two children were born of the parties’ marriage — one child on November 16, 1991, the other on October 10, 1993. By a judgment of divorce nisi dated August 24, 1999, the court ordered that the mother was to have physical custody of the children and that the father was to have “liberal and reasonable rights of visitation, including[,] without limitation,” the schedule set forth in the margin.2
Following the divorce the parties skirmished repeatedly over visitation and custody issues. A complaint for modification filed by the father in October, 2000, seeking physical custody of the children, and a counterclaim filed by the mother requesting that the father’s visitation with the children be reduced, were dismissed (with prejudice) after the parties agreed to mediate the issues raised by the pleadings. On a complaint for modification filed by the father in May, 2003, in which he sought to increase his visitation schedule with the children,3 summary judgment was rendered for the mother on April 1, 2004. No appeal was taken by the husband from that judgment.
On April 21, 2006, the father filed the present complaint for modification alleging, as material and substantial changes in the [800]*800parties’ circumstances since the divorce, that the mother had given birth to two children (one of whom was bom in the past year) with her new husband and that for the first time in the history of his orthodontic practice, the father would be taking on an associate and would be reducing his work schedule to three days per week.4
5The mother filed her answer and a counterclaim seeking an increase in child support.
Thereafter the mother filed a motion for summary judgment or to dismiss the complaint for modification, supported by an affidavit of undisputed facts (which, in turn, incorporated as an exhibit a deposition of the father taken on October 17, 2006).6 The mother argued that because no genuine issues of material fact [801]*801exist in the case, and because the father “can show no substantial and material change of circumstances” since the judgment dismissing his last complaint for modification on April 1, 2004, she was entitled to judgment as matter of law. The mother also argued that the complaint failed to state a claim for relief and, in addition, should be dismissed under principles of res judicata and collateral estoppel.
In his opposition to the mother’s motion, the father, pointing to the mother’s affidavit of undisputed facts (and particularly his own deposition testimony, see note 3, supra) as well as his affidavit of disputed facts,6 argued, inter aha, that there are genuine issues of material fact in the case that must be resolved.
On December 11, 2006, a “judgment on motion for summary judgment” was issued dismissing the father’s complaint for modification.7 The judge set forth the following rationale for his decision:
“This action is taken as there is no genuine issue of material fact and the [mother] is entitled to judgment as a matter of law. . . . The parties do not dispute the [father’s] assertion that he has hired an associate, works fewer hours and could spend more time with the children. However, that circumstance does not rise to the level of substantial and material change in circumstances, as required by Chapter 208, Section 28, such that a modification is required in the best interest of the parties’ minor children. The second prong of the [father’s] complaint is an assertion that the [mother] is devoting less time and attention to their children since she has herself given birth to two more children. However, the sole record source for this assertion is hearsay statements of the children offered by the [father]. Mass.R.Dom.Rel.P. 56(e) requires: ‘[affidavits shall be made on personal knowledge, shall set forth such facts as [802]*802would be admissible in evidence . . .’As the material from the children is hearsay, it is neither the affiant’s personal knowledge nor admissible in evidence.”
The father has appealed.8
The principles governing summary judgments are set out in J.F. v. J.F., ante 782, 789-792 (2008), and need not be rehearsed in detail. It is enough to say at this point that the mother, as the moving party, “must ‘affirmatively demonstrat[e] that there is no genuine issue of material fact' on every relevant issue, even if [she] would have no burden on an issue if the case were to go to trial.’ ” Department of Rev. v. Mason M., 439 Mass. 665, 674 (2003), quoting from Pederson v. Time, Inc., 404 Mass. 14, 17 (1989). See Kernan v. Morse, 69 Mass. App. Ct. 378, 382 (2007). See also Jupin v. Kask, 447 Mass. 141, 146 (2006) (party moving for summary judgment “may prevail by showing that the non-moving party has no reasonable expectation of proving an essential element of his case at trial”). Again, all evidentiary inferences are to be resolved in favor of the party opposing the motion for summary judgment. Nunez v. Carrabba’s Italian Grill, Inc., 448 Mass. 170, 174 (2007).
General Laws c. 208, § 28, authorizes the court to “make a judgment modifying its earlier judgment as to the care and custody of the minor children of the parties provided that the [803]*803court finds that a material and substantial change in the circumstances of the parties has occurred and the judgment of modification is necessary in the best interests of the children.” See Flaherty v. Flaherty, 40 Mass. App. Ct. 289, 289 n.1 (1996) (to change visitation party must demonstrate that material and substantial change has occurred and that change in visitation would be in the best interests of the children). See also G. L. c. 209C,
§ 20 (with respect to children bom out of wedlock, “no modification concerning custody or visitation shall be granted unless the court finds that a substantial change in the circumstances of the parties or the child has occurred and finds modification to be in the child’s best interests”); Custody of Kali, 439 Mass. 834, 838 & n.6 (2003). The requirement of a change in circumstances is grounded in the interests of finality of judgments. See Heistand v. Heistand, 384 Mass. 20, 26 (1981); Champion v. Champion, 54 Mass. App. Ct. 215, 223 (2002).9
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Gelinas, J.
R.S. (father), the former husband of M.P. (mother), appeals from a summary judgment of the Probate and Family Court dismissing his complaint for modification wherein he sought an increase in visitation with the two minor children of the parties’ marriage. As we conclude that there are factual is[799]*799sues in the case that require further exploration, we vacate the judgment and remand the matter to the Probate and Family Court for further proceedings consistent with this opinion.
The summary judgment materials reflect the following. Two children were born of the parties’ marriage — one child on November 16, 1991, the other on October 10, 1993. By a judgment of divorce nisi dated August 24, 1999, the court ordered that the mother was to have physical custody of the children and that the father was to have “liberal and reasonable rights of visitation, including[,] without limitation,” the schedule set forth in the margin.2
Following the divorce the parties skirmished repeatedly over visitation and custody issues. A complaint for modification filed by the father in October, 2000, seeking physical custody of the children, and a counterclaim filed by the mother requesting that the father’s visitation with the children be reduced, were dismissed (with prejudice) after the parties agreed to mediate the issues raised by the pleadings. On a complaint for modification filed by the father in May, 2003, in which he sought to increase his visitation schedule with the children,3 summary judgment was rendered for the mother on April 1, 2004. No appeal was taken by the husband from that judgment.
On April 21, 2006, the father filed the present complaint for modification alleging, as material and substantial changes in the [800]*800parties’ circumstances since the divorce, that the mother had given birth to two children (one of whom was bom in the past year) with her new husband and that for the first time in the history of his orthodontic practice, the father would be taking on an associate and would be reducing his work schedule to three days per week.4
5The mother filed her answer and a counterclaim seeking an increase in child support.
Thereafter the mother filed a motion for summary judgment or to dismiss the complaint for modification, supported by an affidavit of undisputed facts (which, in turn, incorporated as an exhibit a deposition of the father taken on October 17, 2006).6 The mother argued that because no genuine issues of material fact [801]*801exist in the case, and because the father “can show no substantial and material change of circumstances” since the judgment dismissing his last complaint for modification on April 1, 2004, she was entitled to judgment as matter of law. The mother also argued that the complaint failed to state a claim for relief and, in addition, should be dismissed under principles of res judicata and collateral estoppel.
In his opposition to the mother’s motion, the father, pointing to the mother’s affidavit of undisputed facts (and particularly his own deposition testimony, see note 3, supra) as well as his affidavit of disputed facts,6 argued, inter aha, that there are genuine issues of material fact in the case that must be resolved.
On December 11, 2006, a “judgment on motion for summary judgment” was issued dismissing the father’s complaint for modification.7 The judge set forth the following rationale for his decision:
“This action is taken as there is no genuine issue of material fact and the [mother] is entitled to judgment as a matter of law. . . . The parties do not dispute the [father’s] assertion that he has hired an associate, works fewer hours and could spend more time with the children. However, that circumstance does not rise to the level of substantial and material change in circumstances, as required by Chapter 208, Section 28, such that a modification is required in the best interest of the parties’ minor children. The second prong of the [father’s] complaint is an assertion that the [mother] is devoting less time and attention to their children since she has herself given birth to two more children. However, the sole record source for this assertion is hearsay statements of the children offered by the [father]. Mass.R.Dom.Rel.P. 56(e) requires: ‘[affidavits shall be made on personal knowledge, shall set forth such facts as [802]*802would be admissible in evidence . . .’As the material from the children is hearsay, it is neither the affiant’s personal knowledge nor admissible in evidence.”
The father has appealed.8
The principles governing summary judgments are set out in J.F. v. J.F., ante 782, 789-792 (2008), and need not be rehearsed in detail. It is enough to say at this point that the mother, as the moving party, “must ‘affirmatively demonstrat[e] that there is no genuine issue of material fact' on every relevant issue, even if [she] would have no burden on an issue if the case were to go to trial.’ ” Department of Rev. v. Mason M., 439 Mass. 665, 674 (2003), quoting from Pederson v. Time, Inc., 404 Mass. 14, 17 (1989). See Kernan v. Morse, 69 Mass. App. Ct. 378, 382 (2007). See also Jupin v. Kask, 447 Mass. 141, 146 (2006) (party moving for summary judgment “may prevail by showing that the non-moving party has no reasonable expectation of proving an essential element of his case at trial”). Again, all evidentiary inferences are to be resolved in favor of the party opposing the motion for summary judgment. Nunez v. Carrabba’s Italian Grill, Inc., 448 Mass. 170, 174 (2007).
General Laws c. 208, § 28, authorizes the court to “make a judgment modifying its earlier judgment as to the care and custody of the minor children of the parties provided that the [803]*803court finds that a material and substantial change in the circumstances of the parties has occurred and the judgment of modification is necessary in the best interests of the children.” See Flaherty v. Flaherty, 40 Mass. App. Ct. 289, 289 n.1 (1996) (to change visitation party must demonstrate that material and substantial change has occurred and that change in visitation would be in the best interests of the children). See also G. L. c. 209C,
§ 20 (with respect to children bom out of wedlock, “no modification concerning custody or visitation shall be granted unless the court finds that a substantial change in the circumstances of the parties or the child has occurred and finds modification to be in the child’s best interests”); Custody of Kali, 439 Mass. 834, 838 & n.6 (2003). The requirement of a change in circumstances is grounded in the interests of finality of judgments. See Heistand v. Heistand, 384 Mass. 20, 26 (1981); Champion v. Champion, 54 Mass. App. Ct. 215, 223 (2002).9
With these principles in mind we turn to the father’s claims that the judge erroneously concluded that there was no record support for his allegation that the mother has less time for the parties’ children due to the birth of her younger children, that the judge had alternatives to requiring the father to obtain affidavits of the children as a precondition to a consideration of the children’s [804]*804statements, and that further proceedings are necessary to resolve the various issues raised by his complaint.10 In his “judgment on motion for summary judgment,” the judge concluded, essentially, that the father could not demonstrate a material and substantial change in circumstances in this case so as to require a modification of visitation. In arriving at that conclusion, the judge did not consider the father’s allegation that the mother has less time for the parties’ two teenaged children due to her obligations to her younger children because, the judge stated, the sole record source for this assertion was the inadmissible hearsay statements of the parties’ children. This statement is not correct.
It is undisputed that the mother has borne two children since the parties’ divorce — most recently in 2005. It also appears to be undisputed that the mother is the children’s sole full-time care giver. We think it is a reasonable inference from the foregoing, as the father asserted below, that the mother, as the sole care giver for a one year old and a three year old, has (at least somewhat) less time available for the parties’ two teenaged children. In addition to this inference, there was deposition testimony, as we have discussed, based in large part on the father’s personal observations, that the mother is devoting less time to certain of the children’s activities. The mother, in contrast, testified in her deposition that she believed that she spent as much time with [805]*805the parties’ children as she did before the younger children were bom.
It is also troubling in this case that the judge’s resolution of the matter is grounded substantially on the fact that the children’s statements to the father complaining of the mother’s inattention were inadmissible hearsay, not based on the father’s personal knowledge.11 In cases such as the one before us, the noncustodial parent may not, and often cannot, have personal knowledge of what transpires in the custodial parent’s home. Moreover, it may be impractical (or impmdent) for the noncustodial parent to seek to obtain affidavits from (or to depose) the children.12 Cf. Sher v. Desmond, 70 Mass. App. Ct. 270, 281 (2007) (grandparent visitation). Such considerations support the view that it is often the better practice for the judge to appoint a guardian ad litem, with authority to interview the children, in order to investigate the matter of visitation (as the father in this case requested, by motion, and reiterated in his opposition to the mother’s motion for summary judgment).13
As we indicated in J.F. v. J.F., supra at 791, with respect to the modification of custody orders, and as we state now with respect to the modification of visitation orders, a judge must proceed with great caution in deciding whether summary judgment is appropriate. Here, further proceedings are necessary to “flesh out and more fully explore the facts” concerning the mother’s availability for the parties’ children in light of her new family obligations and the impact (if any) on the parties’ children of [806]*806any possible inattention by the mother.14 See Gilchrist v. Commissioner of Correction, 48 Mass. App. Ct. 60, 65 (1999). See also Department of Rev. v. Mason M., 439 Mass, at 676; Kernan v. Morse, 69 Mass. App. Ct. at 383-384. The preferences of the parties’ children should also be explored. Quite simply, the issues in this case, which may implicate the welfare of the children, are “too weighty to end the action at this early stage.” Gilchrist v. Commissioner of Correction, 48 Mass. App. Ct. at 66.15
The “judgment on motion for summary judgment” regarding visitation is vacated and the matter is remanded to the Probate and Family Court for further proceedings consistent with this opinion.
So ordered.