How and when are going to announce?

Michelle • 💙💙💝👼🏼👼🏼👼🏼 FireWire👨🏻‍🚒👰🏽 Photographer 📷
We have family pictures Friday and I think we will take one and save it for an announce that around Christmas. If I can hide it that long. This is my 3rd pregnancy. 
I need ideas! I'm think we take a picture with a sign that says "And then there were 5" with my husband's and sons' hands on my belly.