Sister hitting brother-in-law?

[Czerny88]

While I was visiting my parents, my sister, brother-in-law and nephew came round for a meal. During this meal my sister and her husband had a minor disagreement and she slapped him on the back of the head to make a point. Not particularly hard, but it wasn't done as a "joke" - she was clearly cross with him.

I don't feel this is acceptable simply because it was a woman hitting a man rather than vice versa, and also think it's a very bad example to set their son. I'm assuming that this is not the only time she has done something like this. Should I say something, or keep well out of it? I have mentioned it to my mum (who was there at the time, so it wasn't "telling tales").

My sister and her husband seem to have a close relationship, but she is often complaining about him or berating him for various perceived transgressions. I'm sure he's far from perfect, but from the outside he seems a pretty good husband and father who is reliable and hard-working.

[tribpot]

I wouldn't be happy to see an adult treating a loved one so disrespectfully, regardless of gender. Maybe between siblings in a jokey kind of way but this was neither.

I would tackle her on it, maybe point out how people would (should) react if it was him slapping her.

[helenatroy]

I wouldn't be happy either. Even if she was mucking around hitting another person is never ok or funny.