No, no, no, no, no! Do not just wait on your fiance to decide to talk to his mother that could take years. His mom should have been "talked to" when she hit his ex. The good news is, the reason he is still on the market is probably because mom ran so many great girls away. Don't be a doormat, though. Make sure he knows that it's nice that he is so family oriented but that mom has got to be cordial at the very least and they are NEVER moving into the house. It could be a long marriage with the wrong in-laws. Make sure you are his top priority. Address these issues now because it all needs to be discussed before you get married. My grandma once said, "Don't tolerate anything in the first two years of marriage that you aren't willing to tolerate forever.