If you have a child threatening suicide if he is forced to be with his father, then you and the father need to have a face to face meeting to deal with the threats. You two need to work together to see if the "threats" are a child simply acting out or if there is some substance to the "threats" of suicide.Possibly you and the child's father need to take the child to counseling concerning his behavior. In the interim it might be in all people's best interest to not have the child go see his father short term.