227 N.W.2d 396 STEVEN W. YOUNGBERG, APPELLEE, v. COLLEEN MARIE YOUNGBERG, APPELLANT. No. 39735.Supreme Court of Nebraska. Filed March 27, 1975. 1. Divorce: Parent and Child: Judgments. A decree awarding custody of minor children and fixing child-support payments is not subject to modification in the absence of a material change in circumstances occurring subsequent to […]