Why does he ignore me when he's around his sister?

Anonymous
My boyfriend ignores me completely, when he is around his sister. He doesn't talk to me, he doesn't even look at me. It's really frustrating, and it has got to a point where I dread going to his parents house, when she's there.

We was at a family birthday this weekend, and I had to meet the rest of his family for the first time... He left me alone and he knew I was nervous about meeting them. It wasn't until a family friend reminded him about his girlfriend, that he came over and sat with me.

I know blood is thicker than water, and I don't to come between him and his sister. Since we've only been together 3 months, I'm afraid to bring it up, any Ideas what to do?
Why does he ignore me when he's around his sister?
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