My sister is pushing her family ide for her married live in boyfriend?

I do not condone what my sister is doing. I tried to support her and be positive and tried to get her to look from the outside of the box when it comes to her married-live-in-boyfriend. He says that his intentions are to get a divorce. That's been since June. I truly don't think he is going to and I have a funny feeling that he doesn't have good intentions with my sister. Can't make her see that though. Even when she asks for advice. She just basically blows it out the window. Her boyfriend comes first and then her kids and then the rest of us. My birthday past, my son's birthday past and she forgot. No card either. She hasn't given me a birthday card in four years. She hasn't done anything for my son since he was born either. I'm tired of being the conscience one when it comes to her birthday and holidays. Her excuse is, "i'm too busy", or "i haven't had the time". That's a bunch of hog wash because she goes to WalMart almost every day. No kidding. To be cont....