Shared Economic Responsibility Formula (SERF) – when children spend substantial amounts of time with both parents, the Michigan Child Support Formula considers the child support recipient’s expense savings. SERF may only be used if both parents annually care for the child a minimum of 128 overnights pursuant to the terms of a custody/parenting time order.Spousal Support (formerly alimony) is money to be paid in a divorce, separate maintenance, or annulment case by one spouse to the other for the…