I'm mostly in the closet because no one takes me seriously. Everyone thinks I'm going through a phase. Even my dad thinks I'm going through a phase. I've been out to him for three years.
Honestly, you did your part of the work, no need to reaffirm it to him. Tell who you feel is important and won't try to lock that door on you, and be true to who you are. Those who mind don't matter, and those who matter don't mind. Best of luck.