What if your sister's husband is trying to flirt with you?

That depends... does it bother you or your sister? If it does, let him know. Me and one of my sisters in law flirted a lot for awhile. It was all harmless fun, but we kind of grew out of it after awhile. If it wasn't fun for both of us and my wife, then the joke would be over.

I will talk to him and if he doesnt stop-i will tell my sister. I hate this kind of married men! And this is very unhonest behavior.

Flirting is harmless fun, making a pass is a whole different matter. I would mention to my sister in passing and kind of laugh it off like a joke to show your sister that you are not interested in her husband and to show that you find it funny and are not taking it seriously. I think the best way to handle this is to treat it like a joke.

If I were in that position I would tell him nicely to' knock it off as that is my sister and you be loyal to her or I will punch your lights out lol no but I would tell her and him both, stop it now, she is my sister, respect her as your wife.