I found out my sister is lesbian? Help?

[Rainbow]

1. Your sister might not be lesbian, those things are just stereotypes. 2. Maybe they're best friends and best friends joke around in sexual ways, trust me, it's quite funny. 3. You should just ask your sister if she's dating anyone. 4. I don't think that your mom would react TOO badly to your sister not being straight. 5. Btw, from my answers I might sound like a homophobe. I'm not. If you notice the rainbow flag in my picture which stands for gay pride and also i'm an in-the-closet bisexual (I totally understand with the homophobic parents thing, especially mom thing cuz i'm in the same situation). 6. I bet that if you just plain out ask if your sister is lesbian or bisexual she wouldn't feel weirded out.