EDWARD R. ARDINI, JR., JUDGE
The Trustee of the Finkle-Rowlett Revocable Trust filed a petition in the probate division of the Circuit Court of Nodaway County for instruction and direction in distributing the trust assets. In response, Gregory Stiens ("Stiens"), a beneficiary under the Trust, filed, inter alia , a petition seeking a declaration that the Second Amendment to the Trust was invalid due *97to the executor's lack of testamentary capacity at the time of the amendment. Stiens moved for summary judgment on his petition.
The Trustee replied by filing several motions, including a Motion for a Declaratory Finding and a Motion to Dismiss. The first motion requested that the probate court find Stiens had violated the Second Amendment's no-contest, or in terrorem , clause and thereby forfeited his interest in the Trust. The Motion to Dismiss argued that Stiens, based on the forfeiture of his interest, was no longer a beneficiary under the Trust and therefore lacked standing to proceed with his challenge. The probate court entered judgment in favor of the Trustee. Stiens appeals. The judgment is reversed and the case is remanded for further proceedings.
FACTUAL AND PROCEDURAL BACKGROUND1
Helen W. Finkle-Rowlett executed a trust on August 28, 2009, and served as trustee until her death on June 28, 2016. Prior to her death, Finkle-Rowlett purported to amend her initial distribution directive twice, first in November 2011 ("First Amendment")2 and again in August 2013 ("Second Amendment"). The amendments added beneficiaries and altered the shares that each beneficiary would receive. Finkle-Rowlett's amendments also introduced a no-contest clause to the Trust providing that any beneficiary challenging the validity of the Trust would lose his or her share.3
On January 31, 2017, the successor Trustee designated to serve upon Finkle-Rowlett's death filed a Petition for Instruction and Direction Pursuant to Section 456.2-201.4 The Trustee sought to correct a scrivener's error in the Second Amendment so that one beneficiary would receive assets that had not been accounted for in the amendment. Each of the designated beneficiaries, except Stiens, consented to the proposed distribution.
On February 24, 2017, Stiens filed a petition challenging the validity of the Second Amendment. Stiens specifically alleged, inter alia , that in August 2012, a petition was filed in the Circuit Court of Platte County seeking the appointment of a guardian and conservator for Finkle-Rowlett, with a statement by Finkle-Rowlett's long-time physician attached stating *98that she could not make appropriate financial decisions for herself due to progressing dementia and probable Alzheimer's. On November 30, 2012, a Judgment of Disability was entered, and a conservator was appointed on Finkle-Rowlett's behalf. The Second Amendment to the Trust was purportedly executed on August 6, 2013, approximately eight months later. Stiens sought an interlocutory determination pursuant to section 456.4-420 addressing whether pursuit of his claim that Finkle-Rowlett lacked the requisite capacity to execute the Second Amendment would trigger the no-contest clause,5 a declaration that the Second Amendment was not valid and that the Trust be distributed in accordance with "the First Amendment or other most recently published and properly executed Trust document[,]" and a temporary restraining order to enjoin the distribution of the Trust until the resolution of these issues.
A hearing was held on April 12, 2017, to determine whether Stiens would violate the no-contest clause if he proceeded on his claims. The court entered an Interlocutory Order stating that Stiens, if he chose to proceed on the second and third counts of his petition, would violate the no-contest clause contained in the Second Amendment and forfeit any interest under the Trust.
The parties then proceeded to file several motions. Stiens sought summary judgment on his claim for declaratory relief, alleging that Finkle-Rowlett lacked the requisite legal and mental capacity to execute the Second Amendment to the Trust. The Trustee denied Stiens's uncontroverted facts and argued in response to Stiens's motion that the November 2012 Judgment of Disability determined only that Finkle-Rowlett was disabled and did not address her testamentary capacity.
The Trustee also filed, inter alia , a Motion for Declaratory Finding and a Motion to Dismiss. The Motion for Declaratory Finding requested that the probate court find that Stiens violated the no-contest provision by pursuing his Motion for Summary Judgment on his claims directed at the Second Amendment and thereby forfeited any interest under the Trust. The Motion to Dismiss argued that Stiens's loss of beneficiary status under the Trust terminated his standing to pursue his claims challenging the Second Amendment.
On August 18, 2017, the probate court entered a judgment granting the Trustee's Motion for Declaratory Finding and Motion to Dismiss against Stiens. The probate court explained that Stiens, by proceeding with his Motion for Summary Judgment, violated the no-contest clause and therefore forfeited any interest in the Trust. As a result of this forfeiture, Stiens lacked standing to pursue his claims directed against the Second Amendment. Stiens filed a Motion for Reconsideration, which was denied. The probate court further found that Stiens's claims were ripe for appeal and that there was no just *99reason for delay. See Rule 74.01(b).6
STANDARD OF REVIEW
Stiens appeals, alleging that the probate court erred in dismissing his petition. He specifically contends that he had standing to question the validity of the Second Amendment and, more generally, that no-contest clauses should not apply where a person has "good faith and probable cause to challenge the trust documents."
Whether a court should have granted "a motion to dismiss is a question of law which we review de novo " based on "the grounds raised in the motion to dismiss." Gwyn v. Summers , 514 S.W.3d 628, 631 (Mo. App. W.D. 2017) (citations omitted). "Standing is also a question of law that this court reviews de novo. " Salvation Army, Kansas v. Bank of Am. , 435 S.W.3d 661, 665 (Mo. App. W.D. 2014) (citation omitted).
DISCUSSION
"[S]tanding is a prerequisite to the court's authority to address substantive issues with respect to that party." Salvation Army , 435 S.W.3d at 666 (citations omitted). "A party has standing to sue when it has a justiciable interest in the subject matter of the action."
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EDWARD R. ARDINI, JR., JUDGE
The Trustee of the Finkle-Rowlett Revocable Trust filed a petition in the probate division of the Circuit Court of Nodaway County for instruction and direction in distributing the trust assets. In response, Gregory Stiens ("Stiens"), a beneficiary under the Trust, filed, inter alia , a petition seeking a declaration that the Second Amendment to the Trust was invalid due *97to the executor's lack of testamentary capacity at the time of the amendment. Stiens moved for summary judgment on his petition.
The Trustee replied by filing several motions, including a Motion for a Declaratory Finding and a Motion to Dismiss. The first motion requested that the probate court find Stiens had violated the Second Amendment's no-contest, or in terrorem , clause and thereby forfeited his interest in the Trust. The Motion to Dismiss argued that Stiens, based on the forfeiture of his interest, was no longer a beneficiary under the Trust and therefore lacked standing to proceed with his challenge. The probate court entered judgment in favor of the Trustee. Stiens appeals. The judgment is reversed and the case is remanded for further proceedings.
FACTUAL AND PROCEDURAL BACKGROUND1
Helen W. Finkle-Rowlett executed a trust on August 28, 2009, and served as trustee until her death on June 28, 2016. Prior to her death, Finkle-Rowlett purported to amend her initial distribution directive twice, first in November 2011 ("First Amendment")2 and again in August 2013 ("Second Amendment"). The amendments added beneficiaries and altered the shares that each beneficiary would receive. Finkle-Rowlett's amendments also introduced a no-contest clause to the Trust providing that any beneficiary challenging the validity of the Trust would lose his or her share.3
On January 31, 2017, the successor Trustee designated to serve upon Finkle-Rowlett's death filed a Petition for Instruction and Direction Pursuant to Section 456.2-201.4 The Trustee sought to correct a scrivener's error in the Second Amendment so that one beneficiary would receive assets that had not been accounted for in the amendment. Each of the designated beneficiaries, except Stiens, consented to the proposed distribution.
On February 24, 2017, Stiens filed a petition challenging the validity of the Second Amendment. Stiens specifically alleged, inter alia , that in August 2012, a petition was filed in the Circuit Court of Platte County seeking the appointment of a guardian and conservator for Finkle-Rowlett, with a statement by Finkle-Rowlett's long-time physician attached stating *98that she could not make appropriate financial decisions for herself due to progressing dementia and probable Alzheimer's. On November 30, 2012, a Judgment of Disability was entered, and a conservator was appointed on Finkle-Rowlett's behalf. The Second Amendment to the Trust was purportedly executed on August 6, 2013, approximately eight months later. Stiens sought an interlocutory determination pursuant to section 456.4-420 addressing whether pursuit of his claim that Finkle-Rowlett lacked the requisite capacity to execute the Second Amendment would trigger the no-contest clause,5 a declaration that the Second Amendment was not valid and that the Trust be distributed in accordance with "the First Amendment or other most recently published and properly executed Trust document[,]" and a temporary restraining order to enjoin the distribution of the Trust until the resolution of these issues.
A hearing was held on April 12, 2017, to determine whether Stiens would violate the no-contest clause if he proceeded on his claims. The court entered an Interlocutory Order stating that Stiens, if he chose to proceed on the second and third counts of his petition, would violate the no-contest clause contained in the Second Amendment and forfeit any interest under the Trust.
The parties then proceeded to file several motions. Stiens sought summary judgment on his claim for declaratory relief, alleging that Finkle-Rowlett lacked the requisite legal and mental capacity to execute the Second Amendment to the Trust. The Trustee denied Stiens's uncontroverted facts and argued in response to Stiens's motion that the November 2012 Judgment of Disability determined only that Finkle-Rowlett was disabled and did not address her testamentary capacity.
The Trustee also filed, inter alia , a Motion for Declaratory Finding and a Motion to Dismiss. The Motion for Declaratory Finding requested that the probate court find that Stiens violated the no-contest provision by pursuing his Motion for Summary Judgment on his claims directed at the Second Amendment and thereby forfeited any interest under the Trust. The Motion to Dismiss argued that Stiens's loss of beneficiary status under the Trust terminated his standing to pursue his claims challenging the Second Amendment.
On August 18, 2017, the probate court entered a judgment granting the Trustee's Motion for Declaratory Finding and Motion to Dismiss against Stiens. The probate court explained that Stiens, by proceeding with his Motion for Summary Judgment, violated the no-contest clause and therefore forfeited any interest in the Trust. As a result of this forfeiture, Stiens lacked standing to pursue his claims directed against the Second Amendment. Stiens filed a Motion for Reconsideration, which was denied. The probate court further found that Stiens's claims were ripe for appeal and that there was no just *99reason for delay. See Rule 74.01(b).6
STANDARD OF REVIEW
Stiens appeals, alleging that the probate court erred in dismissing his petition. He specifically contends that he had standing to question the validity of the Second Amendment and, more generally, that no-contest clauses should not apply where a person has "good faith and probable cause to challenge the trust documents."
Whether a court should have granted "a motion to dismiss is a question of law which we review de novo " based on "the grounds raised in the motion to dismiss." Gwyn v. Summers , 514 S.W.3d 628, 631 (Mo. App. W.D. 2017) (citations omitted). "Standing is also a question of law that this court reviews de novo. " Salvation Army, Kansas v. Bank of Am. , 435 S.W.3d 661, 665 (Mo. App. W.D. 2014) (citation omitted).
DISCUSSION
"[S]tanding is a prerequisite to the court's authority to address substantive issues with respect to that party." Salvation Army , 435 S.W.3d at 666 (citations omitted). "A party has standing to sue when it has a justiciable interest in the subject matter of the action." Id. (citation omitted). In arguing that Stiens lacked standing, the Trustee relies on Hawkins v. Lemasters , 200 S.W.3d 57, 61 (Mo. App. W.D. 2006) for the proposition that a party contesting a will or similar instrument has standing if he would "either gain or lose under the contested will."See also Salvation Army , 435 S.W.3d at 666. Accordingly, the Trustee contends that Stiens, by pursuing his claims, triggered the no-contest clause's forfeiture provision, no longer had a beneficiary interest under the Trust, and therefore lacked standing to proceed on his challenge. The probate court agreed, denying Stiens's Motion for Summary Judgment and granting the Trustee's Motion for Declaratory Finding and Motion to Dismiss.
Although no-contest clauses are "to be [strictly] enforced [according to their terms] upon violation without regard to any exception based upon the good faith and probable cause of the contestant[,]"
*100they must nevertheless be valid to be enforceable. Cox v. Fisher , 322 S.W.2d 910, 913 (Mo. 1959) (citation omitted). For a will or trust (and any amendments thereto) to be valid, the testator must have testamentary capacity, i.e. , be at least eighteen years of age, or emancipated, and of sound mind, at the time of execution. Ivie v. Smith , 439 S.W.3d 189, 200 (Mo. banc 2014) (citations omitted). If the testator lacked testamentary capacity at the time of execution, the will or trust (or any amendments thereto) is deemed void. Id. (citation omitted). The invalidity of a will, trust, or its amendments encompasses all clauses therein, including a no-contest clause, and renders them of no effect and unenforceable. See, e.g. , id. at 199 n.12 (noting that because settlor lacked capacity to amend trust, the amendments and no-contest clauses therein had no effect).
Here, the probate court concluded that Stiens's pursuit of his challenge to the Second Amendment divested him, through operation of the no-contest clause, of any beneficiary interest under the Trust. The loss of interest in turn stripped Stiens of the standing necessary to prosecute his claim. However, the probate court's approach erroneously assumed the validity of the Second Amendment, a proposition that Stiens was specifically challenging. Indeed, the gravamen of Stiens's complaint is that Finkle-Rowlett lacked testamentary capacity to execute the Second Amendment which, if established, would render it void and its no-contest clause unenforceable. As a result, the probate court was required to first resolve the issue of Finkle-Rowlett's testamentary capacity to execute the Second Amendment. Only if the Second Amendment is found to have been validly executed can its no-contest clause be enforced against Stiens.
CONCLUSION
The probate court's dismissal of Stiens's claims for lack of standing is reversed, and the case is remanded for further proceedings consistent with this opinion.
All concur.