I think your Dad is Blessed to have you in his life, but please, honor his wishes. If he is "serious" about stopping, then as much as it may pain you, honor HIS wishes. My husband wants to give it up too, and I will honor his wish, when that time comes. But he has not "PUSHED" it, so Iam thankful for that. What ever time we have together, is a PLUS, and an Extra day that we are Blessed.