7. Be loyal.
If the stories start to become embarrassing to your sweetie, say, "Oh, dear, I think I'd better let Sweetie tell me these kinds of stories in his/her own good time" and then change the topic. Unfortunately, many families enjoy cutting their members down a peg when said members show up with a new love interest. If your honey has ever implied--or straight-up told you--that their family doesn't treat them with respect, find out how they want you to deal with that before you enter the fray.