It depends on your legal status before and after the father left. If you are married then he still has full parental rights until a court renders a custody order. If you have been divorced custody should have been addressed in the divorce decree. If you were never married and he has no previously established custodial rights then you have full legal custody.
If He Have Full Custody Then He Doesn't Have To .
Sole Custody until ruled on otherwise. The Glass Ceiling for fathers.
You have the authority to get medical treatment for your son. If you have any doubts or if the father has already objected then consult with your attorney.
With his permission you can.
If the father has full custody, you can't do anything. If you have a custody agreement set up, that includes you having visitation -- take the father to court. If there is no agreement, take him to court, and get it settled. You failed to mention the jurisdiction where you live, marital status, whether there are any existing court orders, whether the father has legal custody and where the father got the authority to prevent you from seeing your child. You need to add details. See related question links.
well by law, he is now a adult, so he can make his own decissions, but i do not think his father can no longer get custody because he is 18, but im not 100% sure
see links
Yes, she can. All she has to do is press suit to have custody awarded, or convince him to give her custody.
That depends on the custody order, but she can file for a change of custody.
yes
Yes you can. The legal guardian decides.
Totally. However you have to consider the state of the father, whether he may not have the means for custody, whether he himself is a drug user or an alcoholic e.t.c, if the father is one of the above then the custody of the son will be either close relatives, foster homes e.t.c.