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Ok, I have an 18 month old son that has my maiden name. I just got married and want to change his last name to mine. Also my husband wants to put his info in the blank space for the father on his birth certificate. Should my husband sign the Acknowlegment of Paternity also even though we're married? The biological father of my son has nothing to do with him and had nothing to do with me through my whole pregnancy. I think its in the best interest of my child not to know his biological father.
Has the bio father ever been determined to be the legal bio father through DNA or by court order? Is there a child support order?

There is nothing proving the biological father is actually the sperm donor. My husband and I have desided we don't want any legal documents proving my husband isn't the biological father. I'm afraid somehow the state will figure out he's not the father and we get in trouble for saying he is.
I forgot to ask another question- are you now, or have you ever been on any public assistance? If so, the state will go after either the bio father, or the legal father for reimbursement.

If you had already been married to your husband when the baby was born he could have signed the acknowledgement of paternit, etc. and he would have been considered to be the legal father. However, I don't know for sure at this point if he can legally do that, or if he'll have to legally adopt the baby. The laws on this vary from state to state, so my advice is to spend a little on a consultation with a family law attorney so that you are sure whatever you do is completely legal. This is very important because you certainly don't want the bio father to surface years from now and have any real legal standing for visitation or custody. Good luck.
Xena :)

You should let bio dad sign birth certificate and then ask bio dad if he will allow your new husband to adopt both children and that would free him from support. Every child has a right to know who there father is. You would want to know who your father is right? Think about it before you do the wrong thing.

I don't think its the wrong thing to do. And if my dad was anything like the bio father I wouldn't want to know. The history he has with me and my 4 year old is undescribable. I don't want my son to know his bio father is a theifing, crack head, woman beating, pedifile. And I know, why did I get with him? He wasn't like that until 2 1/2 years after we had been together. I stayed with him hoping he would change. And second, I didn't want my child to have a broken up home. And now we have and 18 month old that he refures to as, "That F**king Baby". Would you want your child to know him? Not me!
It really doesn't matter if it's the "right thing or wrong thing" to do. The real issue here is what is the best LEGAL thing to do. So, my original advice stands- get a consult with an attorney to know what the full implications are before you make any decision.
Xena