I'm sorry for you, my dad used to always want to take me to Church (I'm agnostic so I didn't go) and go places with him, now hes been gone a little under 3 years (April 27th, as marked on my calendar) and I really wish I had went with him. Maybe you should spend a little more time with him, gain an actual understanding of how he is. Just try to be nice, even if it is hard for you. If it's difficult for you it may be for him too. It might be what you need, and at least say goodbye when he leaves because you may regret it