This question is about my sister and her husband. I've noticed some behaviour of hers that doesn't seem appropriate, but she hasn't really done anything wrong so I'm not sure whether to bring it up with her or not?
So, she's in her mid 30s and married to a man in his 40s. He's a really good husband and father, successful, and a really nice man. He isn't hideous looking or anything but isn't particularly attractive either and is obviously getting older. Sister, on the other hand, is gorgeous (before you accuse me, I admit I'm jealous!). She works out, dresses nicely, does hair and make up regularly, etc. She gets tons of attention, often from younger men. She clearly enjoys the attention. I wouldn't suspect her of cheating on BIL or anything, but she does flirt back and definitely doesn't discourage it.
I've seen it happen when she's with BIL and he doesn't seem amused. I bet it's very hurtful and think she should be more considerate.
I don't like getting involved in their relationship, though, so not sure if I should bother saying anything?