What Should I Do If My Brother-in-Law Likes Me? | Love & Sex

What you must do is make sure that, despite being flattered by his interest,  you give him a loud and clear message to back off and remember you are in-laws, which is a distinctive barrier to having any kind of involvement or relationship that is beyond the boundaries of family. Whatever rivalry and competition may exist between your brother - in -law and his sibling, or you and your sibling ( depending on how you both are related) the only thing you are really flirting with is a recipe for disaster.  So while you may feel flattered, that's as far as is safe to go.