Hi! Congrats! I am pushing 6 weeks. 
This is our 2nd. The first time we told our parents and siblings right away- like literally the day after we tested. We did stress that it was early and didn't tell EVERYONE- just them. 8 weeks for us was right around Thanksgiving and my Grandmothers Birthday so we decided to tell everyone then
This time we have decided not to tell anyone right away including, and mainly because of, our son. I just want to be cautious and would rather not have to explain to him if something happens. We will be 8 weeks this time the Thursday before Christmas and I will have already had my first appointment so we are thinking we will tell everyone for Christmas!!
Tell our son first of course then maybe do a picture of him in a Big Brother shirt with my EDD on a sign and give them to everyone to open at the same time! 