If your Husband likes your sister?

Dump him! He has no respect for women and no respect for you. Believe it or not, you will get his attention when you have enough guts to have respect yourself. Don't tolerate that. If it's obvious he likes your sister, then there's more to what he is capable of doing. Define 'likes.' Has he made passes? Or is it just flirting? I flirt with my wife's friends, but that's as far as it would ever go, and all of us (me, my wife, and her friends) know it. Or are your reading too much into it? Being too quick to 'dump him' can make burn some bridges before they are damaged.