My mom didn't find out for certain until I was nearly 20 weeks. I didn't even tell her, she asked me outright if I was pregnant, and I said no!
Then she asked, "If you were pregnant, would you tell me?" and I said "Nope." So she finally asked me like ten minutes later if I was, and after a few minutes I was finally able to say yes. I felt like I was gonna vomit though, let me tell you! Her reaction wasn't nearly as bad as I'd thought. She was mad at first, and didn't speak... Then she cried a little, as she'd just lost a baby not too long before that. But after about ten minutes of her emotions being all over the place, she was completely calm and fine. I was really surprised she didn't yell lol. She just asked how far along I was, if I'd been to the doctor, what my plans were, etc. She was incredibly supportive the entire pregnancy and I really wish I'd told her sooner. Now she loves Zoe to death!
As for my dad, I didn't really beat around the bush. It was about a week after my gender ultrasound, so I knocked on his office door, opened it, and said "So I have something to tell you. You're going to be a grandpa to a little girl." And he said "Okay." Lol. He's never been one to really have much emotion at all... x) But he adores Zoe.
We told OH's twin next. He was stationed in Bahrain, so we sent him a message with a picture of the ultrasound saying "Here's your niece!" He was really excited.I wasn't there when OH told his mom. He just walked up to her with an ultrasound and said "here's your granddaughter". She didn't say anything negative (to us at least) but just gave us some facts. Neither of us told his dad, OH's twin did with a phone call. I never really got along with his dad before Zoe, but now we're at least on speaking terms. We let them tell everyone else.