What Happens?

I have this serious problem with him, and my mum has this serious problem with him too. It's not as if I didn't attempt to talk to him openly, I just can't. I just can't open upp to him since he was married. I felt that he's a total stranger to me. Sigh. We're brother and sister in half blood, but I don't feel like we are one with connected blood line. What happens to him? What happens to us? What happens to all of us?