i have to agree that your father crossed a boundary talking to you about his issues. but since that line was crossed i suppose you could always talk to your father about how you feel about the situation and how you see it affecting your sister. after you get it all out in the open it is up to him to take care of his business and also to try and help your sister. it will be out of your hands. i also agree that getting back out on your own will help. being supportive to family while not being in the midst is easier and healthier. it will give you time and space to focus on you and then you can decide how much you want to concern yourself with the father and sisters situation.