When I told my mom, she basically guessed.
Mom: You look so different since getting your hair cut
Me: I feel really different, I actually feel more like "me" than I ever have in my life
Mom: Yeah, you seem really different, not just "look" different, I don't know what it is
Me: Well, you know how I've always kinda been "one of the guys"...
Mom: Oh, are you going to become a man? You know, Chastity - or I guess Chaz - Bono did that!
She was really supportive and asked a lot of questions and basically said that she'd love me no matter what. A few months into it though, she got a little down, was grieving a bit, and was having a hard time talking to me about it because she didn't want me to think that she was against it or didn't love me unconditionally. Once we talked about it and we both really expressed how we felt about everything, it got way better after that. And now she's my biggest support through all this.
When we went home to visit relatives (in another province), I didn't want to tell everyone the second I walked in the door and make it be a "big deal" or some sort of formal announcement. The 24 hours that I tried to hide it while everyone saw me as a girl and unintentionally said and did very feminizing/emasculating things, was very hard for me. My mom and I talked about it and she offered to take my relatives aside one at a time and tell them discretely so that it wasn't a "big deal" and that I didn't have to face it all myself. I wanted to still take responsibility for my own coming out, but I accepted her help because I was just so (socially) dysphoric at that time that I couldn't face telling these people who know and love me and risking their reactions making me feel even worse. A few days later, everyone knew and I was able to feel like myself again. All thanks to my mom being such an awesome and supportive person. She is seriously the best mom ever.

With my dad (who I have only been back in touch with these past few years, we're not super close, but he's a nice guy who sincerely cares about me), he sent me a text message saying "So, I hear you're going to be a boy now?" And I was like "Um, yes, where did you hear from?" Apparently his mom saw something on Facebook (I guess I hadn't locked down my privacy settings as much as I'd thought by then) and told him about it. Anyhow I was driving at the time, so I told him "the basics of it is yes, I'm trans. we can talk on the phone later and I'll explain more". When we did get the chance to have a phone call, he was totally cool with it, and just wanted to know how I felt and hear about my journey in learning about this aspect of myself.
Nowadays, he's very used to it, calls me "son" and "my boy" and such. We're still not super close, but I feel like he accepts me for me, and that's nice.