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Hello. My name is***** will be happy to answer your question.
I am sorry to hear about this unfortunate situation.
1) Generally, if the person has signed the Birth Certificate acknowledging paternity, then such person would be considered a legal parent and would be liable for child support regardless of whether the child biologically his or not.
2) Generally, once the child is legally adopted by another adult, then the parent who had his parental rights terminated would no longer owe further child support, but would still be liable for any delinquent child support and the mother would not be able to choose whether to pursue collection of the delinquent child support, since the child support is owed for the minor child's benefit.
I wish you the best of luck!
Thank you for the additional information, but unfortunately, it does not change my answer, since when a man signs birth certificate, it is legal acknowledgement of the paternity and the man becomes legal father of the child, regardless whether the child is his biological child and also any child custody / child visitation issues are separate from any child support obligations and can be addressed with the local family court by the father who is being deprived of visitation.