No, it is not a bad idea for you to date your best friends brother-in-law. Both of you are adults and should be able to have a relationship based on how you feel about one another instead of how other people may feel.

Is it wrong to date your friends sibling?

Originally Answered: Is it ok to date my friends sister? Theres nothing wrong if you date your friends Sister as long as your friend is ok with it. Ask him/her about it, make him/her understand and if he agrees then you are good to go buddy.