I and my ex. Been divorce for a while now. I have full custody for all of my kids legally and physically and my Ex. Been paying about $500 for the childsupport. My question is My current husband wants to adopt these kids and wants to change their last name to his. Do you think if that possible by law that he can do that since I have the legal and physical custody of all these kids? And if that does my ex still obligate to pay childsupport if these kids been change their last name to their step father?. Thanks much for your help.