Bill3,
The only person who comes to mind is my cousin who says she is bi, but since my biological mother disowned me, I have no connection to her side of the family, and I now live on the opposite side of the country from them with my dad and stepmom.

The only person I know for certain would stick by me if I came out is my older stepsister. We're very close, and she has informed me during private conversations that she doesn't share the rest of our families veiw on homosexuals.