Sounds like y'all should stop having kids until you can sort out your own lives. As for him, document what you can about where is money is likely going. He doesn't get to choose which family to support. If he doesn't pay child support, demand full custody of your kid, no visitation, no contact, no nothing until he lives up to his existing obligations. But at the end of the day, you can't extract blood from a stone - if he works a low end job he probably doesn't have an extra $355 a month and you can't sue broke people for much. It'll just end up a big stack of IOUs.