I hate to hear all of what your family, is having to endure. Like Top stated, maybe it is hard on your granddad loosing his wife and his home or as Top asks was he always like this or is this behavior new? It would be wise to seek out his GP and about getting some anti depressants. Your family can not continue with the stress it has undertook if you are already at your tethers end, your sister is now having accidents when asleep and your mom is acting out with drink and smoke in order to cope. Those are serious warning signs that should not be ignored. Please vent here for help, and please take to heart what is written it hopes it will help. On the worst side, if he has always been this way, I think it would be best if he is sent to a home. For he will not ever change, if it is new, medicine, love and prayer will help. And this place to help you vent.