My mom knew way before my dad, but my parents are divorced and I mainly lived with my mom at the time. I think I was around 15 or 16. It finally came out in counseling that I had a girlfriend and it was so much better than I expected. He gave me the whole 'I'll love you no matter what' speech, and seriously, I cried because I was so relieved. My dad's side of the family is pretty religious and it's hard to read what he's thinking a lot of the time. I'm finding out more and more that he's the rebel on that side of the family.
Only a couple people in my extended family know and they're on my mom's side of the family. They're the more relaxed side haha. My dad's side is probably the most clueless and I'm not sure if I woud prefer to keep it that way or not. They're great people, but it's still scary to think about someone hating you for any reason.
And to all of those on here that are still in the closet, I want to let you know that eventually it does get easier.