my dh's ex is supposed to pay $116 a month. If she were to get custody (my dh is the custodial parent) he would have to pay around $1000. It's crazy. Also, his ex is $20,000 in arrears and if she were to get custody, his current support would not be allowed to go toward paying off those arrears, because the child cannot be "deprived" of support, even though that support is almost 10 times what she is supposed to pay. Luckily for us, we've survived several custody attempts on her part, but all her custody grabs were centered on the support.