ONLY if she is married to the father ,and the father is in jail.then she may become the legal guardian ,if the biological mother is unfit or absent from the child life,
A child may be adopted by someone else whether or not the biological parents are alive. If they are alive permission is required. Much depends on who is the legal guardian. Consulting a solicitor/lawyer would be advisable. In the case mentioned in the question, the step-father can adopt as he is married to the biological mother.
No, he shouldn't be able to if she is legally married. If she was underage at the time of marriage and the custodial parent signed off on the marriage and that should have been the end of parental custody.
Not unless he is the legal guardian.
no, your mother (or legal guardian) has to sue
He can be sued by the child's mother or other guardian, and/or by the State.
No. Only the biological father can sign it.
A biological father is the father of the child. A step-father is not. If the step-father has legally adopted the child that is not his when married then yes, he would have to pay support. If not married and the child is not his then no, he does not have to pay child support, but he may have to go to court to resolve the matter.
If you are adopted, your biological father has no legal standing. And there is no requirement that any parent sign a wedding certificate. If you are underage, you may need signatures to obtain the marriage license and it would be the adoptive parent that would have to sign.
Depends on the state
Yes , the biological father will be held legally responsible for the support of his child .