Board Thread:General Discussion/@comment-24386552-20141019001106/@comment-4287993-20141019171738

Oh right! For whatever reason, I thought they were supposed to tell their spouses the night of the carousel meeting. My bad.

Thatcher probably left the house, but in the ER notes, you can see that Ellis was kept under observation for a week. So in that time, I assume Meredith stayed with her father. Then I guess she wouldn't keep what happened a secret for him, as he's her father after all.