Announcing to family question

Megan • Married 8 years - we have a 5 1/2 year old daughter and we are expecting our son 7/6 💙
Expecting baby #2 - those of you that told your mom or other family member - how did you know they wouldn't tell everyone else before you get a chance? Did you tell them not to share? Or not to post on Facebook? I really want to tell my parents but I think they would be sad to not be able to share their excitement if I said please wait to tell anyone so I'm just seeing what y'all did. Thanks!!