How to deal with a dying father at age 16 ?

Aw, I'm sorry. Well first of all, life is about forgiving. And he is your father. So even though he did all the things he did, I would forgive him, and tell him that you love him. Because even if you don't feel like you love him right now, soon after he's gone it can all come crashing down on your heart and you'll regret it later. Good luck.