Could I open divorce and get her for adultery?

Adultery has no legal consequences However you should know that a child born during marriage is presumed to be the Husbands child. Therefore you need to get an attorney to help untangle this or you could be paying for a child not your own.

Your question is unclear. Are you being asked to have responsibility for the additional child. You can never reopen a dissolution unless it involves a missing child. In our state we are a no fault state - meaning it does not matter why the two of you? (or one of you) wanted to end the marriage. Adultery is a moral issue, not a legal one. If you are not being asked to pay support, there is not reason to do anything. If you are invited to let the younger child come with your child for visitation. consider it your community service to do so.? The second child knows nothing about how it was conceived and just wants to have love from a parental figure. You will get more benefits than you can possibly imagine, but again this is a moral issue, not a legal one.

New York is a no fault state so it really wouldn't matter. You should on be responsible for child support for the child you fathered.

No, your divorce is over and done. Move on with your life and let her wallow in hers.

California is a "no fault" divorce state. It doesn't matter if a person commits adultery in a divorce case.

Your divorce is final if it is final. Move on with your life, and without your cheating former wife. Is she even worth the time you seem to still spend thinking on her and her perceived lack of honor and commitment to you?