Announcing to others

Asia • Mommy to a boy 💙 baby #2 due feb ‘18.💗 happily married 😍

I'm 10w6d pregnant with baby #2 me and my husband haven't told anyone yet. We're thinking of doing an announcement on fb with my son when we go to the beach in 2 weeks. My question is should I tell my family members separately from the post? Is it wrong from for them to find out that way? I was thinking of doing a photoshoot with my son on the beach announcing the arrival of the new baby. So I wanted it to be a big nice surprise for everyone .