My wife and I have been together for close to 4 years. When we first met, her son (not my biological son) was just an infant. He has been and will always be considered my own. Our son will be entering kindergarten soon, and my wife and I would like him to have the same last name as us and our daughter. The biological father's name is not on our son's birth certificate and our son has my wife's maiden name. The biological father has never been in the picture and hasn't seen or spoken to my wife or our son in over 4 years. We are going to go through the steps for a legal adoption so that I have all necessary rights in case anything should happen to my wife. However, we understand that this takes time. What would we have to do to get our son's last name changed to ours prior to him entering kindergarten? Is there a quicker/easier step besides legal adoption at this point with my wife's permission/signature? Please respond. Thank you so much in advance.