I agree with Julie. I am not an attorney but your son being 16 years old may give him considerable say in who is with, who he sees and when. The laws on "domestic litigation" (the new politically correct term for divorce) differ from state to state. In any case, make sure that your son understands that he does not have to choose sides in this matter and that he can see and love both of you and both of you love him. The issue is between you and your wife, not your son.
Above all, keep the whole thing civil. This will all pass and you will both have your son and your lives ahead of you.