Indiana Code Title 31. Family Law and Juvenile Law § 31-30-1-12

Sec. 12. (a) Subject to subsection (b), a court having jurisdiction under IC 31-17-2 of a child custody, parenting time, or child support proceeding in a marriage dissolution has concurrent original jurisdiction with the juvenile court for the purpose of modifying custody, parenting time, or child support of a child who is under the jurisdiction of the juvenile court because:

(b) Whenever the court having child custody jurisdiction under IC 31-17-2 in a marriage dissolution modifies child custody as provided by this section, the modification is effective only when the juvenile court having jurisdiction of the child in the child in need of services proceeding or the juvenile delinquency proceeding:

(c) If, under this section, a juvenile court:

the order modifying child custody, child support, or parenting time survives the termination of the child in need of services proceeding or the juvenile delinquency proceeding until the court having concurrent original jurisdiction under subsection (a) assumes or reassumes primary jurisdiction of the case to address all issues.

(d) A court that assumes or reassumes jurisdiction of a case under subsection (c) may modify child custody, child support, or parenting time in accordance with applicable modification statutes.