Family feuds

Carissa
Any suggestions on how to make husband and sister somewhat get along? My sister happens to have a dirty mouth and my husband has corrected her on occasion, because our 3 year tends to repeat. Over the weekend, every other word out of her mouth was a swear word. So my husband said, "I'm going to get you a thesaurus so you can use other words." I corrected him and said, "that was mean and you shouldn't have said it," but I know my sister took it hard and I have a feeling my mom and aunt will start drama saying he "talks down to her." Any suggestions?