MORGAN, Justice.
Defendant, Terrence L. Andersen (Terry), appeals from an order of the trial court modifying the original divorce decree by awarding custody of his and his ex-wife’s two youngest children to plaintiff, Michelle A. Andersen (Shelly). We reverse.
In June of 1983, Shelly and Terry were divorced. At the time of the entry of the judgment and decree of divorce, Terry was awarded custody of all five of the children born of the marriage who then ranged in age from one year, ten months to ten years, eight months. Regarding this custody award, the trial court made the following finding of fact: “Both parties hereto are loving and caring parents. However, at this time, Plaintiff mother is not ready to have the custody of the children because of her transient lifestyle and male companion, all of which fail to provide a stable, wholesome and nourishing environment for the minor children.” As a result of this finding of fact, the trial court made the following conclusions of law: “Defendant [Terry] is a fit and proper person to have custody and control of the minor chil-dren_ The defendant shall have custody of all five of the minor children, subject to reasonable visitation rights by the Plaintiff.”
Following the divorce, Shelly and a male companion moved to Montana and subsequently were married. Terry remained in Brookings with the children. In 1984, Shelly and her new husband moved back to South Dakota in order to be closer to her children and his children from a previous marriage. At this time also, Terry became engaged to marry another woman and moved his family from Brookings to Madison. Following these events, Shelly applied for a modification of child custody based upon a change of circumstances.
Following hearing, the trial court in its memorandum decision, which was incorporated in its findings of fact and conclusions of law by reference, held that there had been a substantial change in circumstances since the entry of the decree of divorce. The trial court found that Shelly remarried, obtained employment, and appeared to be in a fairly stable economic situation. The trial court also found that Terry moved his family to Madison and was engaged to marry another woman. In its memorandum decision, the trial court stated:
This decision of the Court is not intended to suggest that the defendant [Terry] has done a poor job of caring for the children during the past few months. On the other hand, it was not the intent of this Court to determine at the time of the divorce that the plaintiff [Shelly] was an improper person to have the custody of the children. The custody determination was based on the fact that the plaintiff did not have a stable situation which would be conducive for the proper rearing of the children. She did not have a job sufficient to establish a stable economic situation and the relationship with the person who is now her husband, did not provide a proper social or moral environment for the rearing of children.
Following this, the trial court entered its order changing custody of the two youngest children aged four years and five years, eight months to Shelly and custody of the three older children remained in Terry. It is from this order that Terry appeals.
[365]*365The trial court is vested with broad discretion in deciding questions of child custody modification and the court’s decision will be reversed only upon a clear showing of an abuse of that discretion. Menning v. Menning, 272 N.W.2d 828 (S.D.1978). The seminal case on the burden of proof and the modification of a custody award is Masek v. Masek, 90 S.D. 1, 237 N.W.2d 432 (1976). In Masek, this court stated:
To state the rule we have adopted in change of custody cases, the parent seeking modification of custodial rights has the burden of proving (1) that there has been a substantial and material change of circumstances since the decree of divorce was entered, and (2) that the welfare and best interests of the children require the modification being sought. Either factor standing alone will not justify a change of custody — both must be present. This is a heavy burden, but the courts, the parties and especially the children must be protected from endless and vexatious litigation and the resulting uncertainty flowing therefrom.
90 S.D. at 6, 237 N.W.2d at 434. See Powell v. Powell, 336 N.W.2d 166 (S.D.1983); Hanks v. Hanks, 334 N.W.2d 856 (S.D.1983).
The trial court found that there has been a substantial and material change of circumstances since the decree of divorce was entered. While we do not conclude that this finding was clearly erroneous, there does appear to be a patent inconsistency in that the trial court viewed in a positive light Shelly’s marriage to the paramour whose relationship caused the divorce, while viewing the pending marriage to Terry in a negative manner. In any event it does not appear in the record that the best interests of the children were considered when breaking up the siblings as a unit. The general rule is that the best interests and welfare of the children are promoted if they are kept together in one home.
We find that Shelly has not met her burden by a preponderance of the evidence in proving both factors needed to modify a custody order. This is exactly the type of situation which the court cautioned against in Masek, supra.
In borderline cases, as this was, we recognize that the parent not having custody might be tempted to relitigate the custody issue in the hope that a change in the composition of the Supreme Court might change its opinion. But this would not be fair either to the parties or the children, and we will be especially vigilant to avoid rewarding persistence in this type of case.
90 S.D. at 6, 237 N.W.2d at 434.
In summary, we hold that the trial court abused its discretion in awarding custody of the two youngest children to Shelly. The record fails to establish that the welfare and best interests of the children re[366]*366quire the implementation of the extreme remedy ordered by the trial court.
We reverse.
HENDERSON, J., and FOSHEIM, Retired Justice, concur.
WUEST, C.J., and SABERS, J., dissent.
MILLER, J., not having been a member of the Court at the time this action was submitted to the Court, did not participate.
The following cases support the strong public policy toward preservation of the sibling relationship. In Re Marriage of Gonzales,
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MORGAN, Justice.
Defendant, Terrence L. Andersen (Terry), appeals from an order of the trial court modifying the original divorce decree by awarding custody of his and his ex-wife’s two youngest children to plaintiff, Michelle A. Andersen (Shelly). We reverse.
In June of 1983, Shelly and Terry were divorced. At the time of the entry of the judgment and decree of divorce, Terry was awarded custody of all five of the children born of the marriage who then ranged in age from one year, ten months to ten years, eight months. Regarding this custody award, the trial court made the following finding of fact: “Both parties hereto are loving and caring parents. However, at this time, Plaintiff mother is not ready to have the custody of the children because of her transient lifestyle and male companion, all of which fail to provide a stable, wholesome and nourishing environment for the minor children.” As a result of this finding of fact, the trial court made the following conclusions of law: “Defendant [Terry] is a fit and proper person to have custody and control of the minor chil-dren_ The defendant shall have custody of all five of the minor children, subject to reasonable visitation rights by the Plaintiff.”
Following the divorce, Shelly and a male companion moved to Montana and subsequently were married. Terry remained in Brookings with the children. In 1984, Shelly and her new husband moved back to South Dakota in order to be closer to her children and his children from a previous marriage. At this time also, Terry became engaged to marry another woman and moved his family from Brookings to Madison. Following these events, Shelly applied for a modification of child custody based upon a change of circumstances.
Following hearing, the trial court in its memorandum decision, which was incorporated in its findings of fact and conclusions of law by reference, held that there had been a substantial change in circumstances since the entry of the decree of divorce. The trial court found that Shelly remarried, obtained employment, and appeared to be in a fairly stable economic situation. The trial court also found that Terry moved his family to Madison and was engaged to marry another woman. In its memorandum decision, the trial court stated:
This decision of the Court is not intended to suggest that the defendant [Terry] has done a poor job of caring for the children during the past few months. On the other hand, it was not the intent of this Court to determine at the time of the divorce that the plaintiff [Shelly] was an improper person to have the custody of the children. The custody determination was based on the fact that the plaintiff did not have a stable situation which would be conducive for the proper rearing of the children. She did not have a job sufficient to establish a stable economic situation and the relationship with the person who is now her husband, did not provide a proper social or moral environment for the rearing of children.
Following this, the trial court entered its order changing custody of the two youngest children aged four years and five years, eight months to Shelly and custody of the three older children remained in Terry. It is from this order that Terry appeals.
[365]*365The trial court is vested with broad discretion in deciding questions of child custody modification and the court’s decision will be reversed only upon a clear showing of an abuse of that discretion. Menning v. Menning, 272 N.W.2d 828 (S.D.1978). The seminal case on the burden of proof and the modification of a custody award is Masek v. Masek, 90 S.D. 1, 237 N.W.2d 432 (1976). In Masek, this court stated:
To state the rule we have adopted in change of custody cases, the parent seeking modification of custodial rights has the burden of proving (1) that there has been a substantial and material change of circumstances since the decree of divorce was entered, and (2) that the welfare and best interests of the children require the modification being sought. Either factor standing alone will not justify a change of custody — both must be present. This is a heavy burden, but the courts, the parties and especially the children must be protected from endless and vexatious litigation and the resulting uncertainty flowing therefrom.
90 S.D. at 6, 237 N.W.2d at 434. See Powell v. Powell, 336 N.W.2d 166 (S.D.1983); Hanks v. Hanks, 334 N.W.2d 856 (S.D.1983).
The trial court found that there has been a substantial and material change of circumstances since the decree of divorce was entered. While we do not conclude that this finding was clearly erroneous, there does appear to be a patent inconsistency in that the trial court viewed in a positive light Shelly’s marriage to the paramour whose relationship caused the divorce, while viewing the pending marriage to Terry in a negative manner. In any event it does not appear in the record that the best interests of the children were considered when breaking up the siblings as a unit. The general rule is that the best interests and welfare of the children are promoted if they are kept together in one home.
We find that Shelly has not met her burden by a preponderance of the evidence in proving both factors needed to modify a custody order. This is exactly the type of situation which the court cautioned against in Masek, supra.
In borderline cases, as this was, we recognize that the parent not having custody might be tempted to relitigate the custody issue in the hope that a change in the composition of the Supreme Court might change its opinion. But this would not be fair either to the parties or the children, and we will be especially vigilant to avoid rewarding persistence in this type of case.
90 S.D. at 6, 237 N.W.2d at 434.
In summary, we hold that the trial court abused its discretion in awarding custody of the two youngest children to Shelly. The record fails to establish that the welfare and best interests of the children re[366]*366quire the implementation of the extreme remedy ordered by the trial court.
We reverse.
HENDERSON, J., and FOSHEIM, Retired Justice, concur.
WUEST, C.J., and SABERS, J., dissent.
MILLER, J., not having been a member of the Court at the time this action was submitted to the Court, did not participate.
The following cases support the strong public policy toward preservation of the sibling relationship. In Re Marriage of Gonzales, 373 N.W.2d 152, 155 (Iowa App.1985) (siblings benefit from knowing one another, thus, courts do not ‘‘[sjeparate siblings unless there are compelling reasons to the contrary”); In Re Marriage of Little, 26 Wash.App. 814, 818, 614 P.2d 240, 243 (1980) (reversible error to split custody of four minor children where they were integrated into father’s home and were invited to rely upon his stabilizing influences and extended family); Andera v. Andera, 277 N.W.2d 725 (S.D.1979); Boroff v. Boroff, 197 Neb. 641, 648-49, 250 N.W.2d 613, 617-18 (1977) (reversible error to separate children where both parents were fit); Ebert v. Ebert, 38 N.Y.2d 700, 382 N.Y.S.2d 472, 346 N.E.2d 240 (1976); 24 Am.Jur.2d Divorce and Separation § 991 (1983).