El D, that is far more important than you can realize, for both of you. For him now, and for you later on, knowing you were there, and not wishing you had gone. It makes the journey to the other side far more easy for him, with you there, even if you have to leave before then. It gives him peace of mind, knowing he did well with you, and peace of mind for you knowing you were there to tell him what he means to you, and to thank him for all he has done for you. Including knocking some of the rough edges off of you when you needed it.
Again, Buddy, my thoughts and prayers are with You and your Dad and Family.
Wayne