Your ex is probably out of luck. The problem is not just the birth certificate. He is legally the father of your child. Tell him to go see a lawyer to find out if there is any way around this but he signed a legal document and probably cannot get avoid his responsibilities now.
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This is a mess. If he was not the biological father why did he sign the VAP? There is a very small window of time to rescind that signature. He needs a lawyer ASAP.
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