Как правильно поступать мне и моему мужу в отношении его матери?

The author describes difficult relationships with their mother-in-law, who leads an antisocial lifestyle, including alcohol use and commercial sexual activity. She insults the author, her husband, and their young son, which led to the child having to live with their grandmother. The mother-in-law’s behavior creates constant conflict, disrupts peaceful living in the shared apartment, and negatively affects the health of both spouses. The husband has stopped communicating with his mother, but it is impossible to completely avoid contact due to housing issues. The author is looking for ways to set appropriate boundaries in this situation.