I don't believe so. You'd have to check the laws in your state, but I believe in most places other children he may have aren't factored into the payments.
Depends on the state and jurisdiction, but probably not. They would consider it just as if he had a baby with you and not change his child support. They could even raise his support obligation. It is a gamble. If his ex's new husband adopts their child, then the support obligation would likely cease.
Most likely not, though if the child support is under a judge's purview, a judge has the discretion to lower or raise child support for any reason. My judge lowered my ex-husband's child support because he wanted to get a second bachelor's degree, for example.
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