Conflicted

There's something I have been struggling with for a while now, I thought I would be able to tell it, but now I'm starting to wonder of its a good idea anymore.
Since it has been about 6 years since I stopped talking to my mom, and it's only been a few months now that I've been communicating with her again, I don't know if I can trust her or not.   In truth, my brother is guy.   I found out a year and a half ago.   No surprise to me, I've always known, since he was 5, and my mom took him flower shopping, or that he liked to sew and knot.  I don't know why it took so long for him to come out.  It's still being kept kind of quiet.   None of his co-workers know, although he suspects at least one person knows.  On one hand I think my mom should know something about his life if he's not going to talk to her again.  Then again we have been the only two that stick together through all the family troubles, and I could be sacrificing that.  I know he'd be angry if I told her.   Lately I might even say that there's a part of me that's going about this through spite because he doesn't spend any time with me and we barely speak.   I'm weighing my options, choose carefully.