Of the 13.4 million custodial single U.S. parents, half have a legal or informal child support agreement with the other parent. Child support is used to pay for food, rent or mortgage payments, education, clothing, childcare, healthcare, transportation, and everything else that a child depends upon. As a parent’s financial situation changes, they may have a decreased or increased ability to pay child support or to financially support their child as the custodial parent. Moreover, child support may need to be modified due to a change in the child’s circumstances, such as needing cancer …