Here's the deal. My wife and I dated for nine years (1992-2000). We broke up and went our seperate ways for 2 years before reuniting. When we got back together in the summer of 2002, she had just had just given birth to a son 6 months prior. We got married in October of 2003 and I am the only father the our son knows.
My wife was living in Madison, WI when she became pregant, but because her physician put her on bed rest she decided to come back home. Our son's biological father apparently has multiple children by other women and saw my wife's returning home as a sign of relief. The biological has never tried to make contact with us. Our son knows me as his father. At our request, we asked his daycare that he be taught that his last name is my last name as we plan on going through the adoption process.
Here's our problem. Our son is getting ready to start pre-school and the name on his birth certificate is the name that he must go by. We have not started the adoption process as of yet. I checked with my states Vital Statistics department. The biological father's name is not on the birth certificate. They sent me an acknowledgement of paternity form for my wife and I to complete. We must return this form notarized along with a fee and this will change our son's name on the birth certificate.
The problem with this form is that I legally become the father, but I can rescind my acknowledgement at any time. I guess it's not as solid as a legal adoption.
My question is what rights does the biological father have after this form has been filed with our state and the name has been changed? God forbid things changed between my wife and I or something happened to her. We are looking for peace of mind that no one would come in and place claim on our son. We plan on telling our son the truth that I am not his biological father. If I walked in our home and found my wife in bed with another man I would divorce her, but I would never rescind the acknowledgment of paternity. If this form is legally binding and the biological doesn't have any rights, is there any reason to proceed with the adoption process?

