The reason I ask this question, is because I'm going to have my younger half sister (same dad, different mom) do a reading for the ceremony. However, my parents' divorce was extremely nasty, and my mom still hates my dad, so I'm not sure how she'd react to spending a few hours (including at the dinner table) with "his" daughter. I asked her and she did the "five-minute-long-pause-followed-by-not-remotely-believeable-it's-fine". Do I need to have her there to do the rehearsal or can I get away with just having the BP and parents there?
I know it really sounds mean, but I don't want to put my sister in a situation either that she'd be uncomfortable with. She's 21, so old enough to catch undercurrents of situations.

If I wanted to hear the pitter-patter of little feet, I'd put shoes on the cat.
