Child Support Obligation
Both parents have a legal obligation to financially support their dependent children. While the custodial parent has a legal obligation to keep food in the kids' mouths and a roof over their heads, the non-custodial parent must give his spouse money to help pay for those costs. His obligation is not fulfilled by giving the money to anyone other than the spouse or a state agency designated to collect child support.
Control Over Family Finances
When you are the non-custodial parent obligated to pay child support, you have no control over how the money is used or how your ex-spouse manages her family finances. If you believe that your spouse is failing to meet the basic needs of the children, you can bring a complaint for child neglect to the appropriate authorities.