Disney movies are always the way to go. Up was a good suggestion. Also the Incredibles, and Finding Nemo. These may seem like childish suggestions... And they may be... But they do deliver a powerful message.
I wouldn't rely on a movie for a reality check, you want to know the importance of family, visit the homeless who have no family and the ones who have families and are doing every thing they can to keep each other together, visit terminally ill children and see just how important family is visit a soup kitchen, look into your own heart, im pretty sure you know how important your family is, how much you really love them even when you think you hate them, even when you think they are unfair, or how much easier your life would be with out them, you can never lie or bluff your heart because it knows everything.So when you need a reality check on how important your family is look inside you and you will have the answer.