When is too early to tell?

So if all goes right we will have some big news to share. AF is due on 12-4, Thanksgiving day would be 5 days before missed period and I plan on testing that morning. If I get a bfp would later that day be too early to tell family? Saturday after Thanksgiving we see hubs family to celebrate and we only see them once a year. We really want to share the news but 4 weeks preggo might be way too early... Thoughts? Christmas seems like a good time to share the news but the way it's working out this year we won't see as much of our family during Christmas time as we live far away.