This should be very easy to do. You will need an attorney. First, they will file the papers, and serve the bio dad. If he doesn't contest to the adoption, you go to court and have your hubby adopt. If he contests, he will show up in court and tell the judge his side, why he doesn't want the adoption to proceed, he hasn't been in the childs life for years so his chances of stopping the adoption are slim. If you don't know where the man is, most likely what you will have to do is run an ad in the newspaper where he was living the last you knew and advertise that if he doesn't respond that the child will be adopted. You have a GREAT case and I don't foresee any problems...Get the ball rolling, get this childs FATHER to adopt her, and live happily ever after. Good luck to you and your wonderful family..I love posts like this!
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*There is no love, like the unconditional love of a Mother*
-I am not an Attorney, any advice given is strictly advice-