You can seek child support from the biological father, but the man who signed the birth certificate has no legal obligation to your daughter. This is a sad situation for your daughter more for the loss of the relationship than for the loss of the finances. In her best interest, maybe you should offer to keep the relationship open even without receiving child support from him.
Every legal matter is fact specific, and there are often nuances in every case. This is intended for comment only, and does not create an attorney client relationship.
I don't know what you're goal is by reading this. Does the guy on the birth certificate want to maintain himself as dad? Sounds like maybe he doesn't. That's not a legal matter any longer, it's a personal one.
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If you are trying to determine whether you can seek Child Support from the biological father of the child the answer is very clear. You can. As for the relationship between your daughter and the man you believed to be her biological father, you should consider contacting an attorney on how to best tackle the delicate situation. The best course of action will depend on the specifics in your case.
No attorney client-relationship is created by the above communication. You should always consider contacting an attorney with the details of your case in order to receive the most useful and accurate information.