As for what happened?
It was a complete non-event, go figure.
Sister was running late, so decided to meet parents at the doctor's office. She didn't come here beforehand, and didn't show up afterwards, and my parents just walked in like it was any other day and nothing had happened.
Yes, I am a walking contradiction in that I was dreading the possible kersplosion, but also wanting to see it happen for morbid curiosity.
Honestly, the reason nothing major happened is probably *because* it wasn't a social call and my sister was just in and out to talk to the doctor.