Family courts base their child custody decisions on the best interests of the child, and your desire to modify your custody arrangement must meet this same standard to succeed. State law generally seeks to avoid disrupting the living arrangements of children without sufficient cause. Even so, many legitimate reasons could persuade a court to modify the parenting time order in your case or change custodial arrangements where appropriate. approve your child custody modification petition. Every case is different and the facts of your case should be addressed with a family law lawyer before proceeding. Child custody lawyers Indiana can provide advice specific to your situation before you approach a court. In general, many changes in circumstances for parents or children could support a custody modification.