I’m engaged to a lovely 30-something who lives with her aging 70-something mom. Their setup is mutually beneficial financially, and over the course of our relationship, it’s become evident that they have a close bond. As we embark upon marriage and a life together, my fiancé has been reluctant to move in with me and leave her mom behind. Her mom is on government assistance and doesn’t have many great living options. Furthermore, their home life reveals a codependency and occasional toxicity when her mother becomes disgruntled about something. Boundaries are broken, tears are shed, voices are raised, etc. While we could likely find somewhere close (enough) that is safe for her mom to live, my fiancé and her mom maintain that a life alone in such a place is sad and lonely... no way to spend the final years of her life. While I am sympathetic to this, I am terrified at the alternative: living together. I’ve made it clear that a life together under one roof isn’t ok with me, so my fiancé continues to pursue a detached mother-in-law suite as the solution. I’ve heard horror stories about this, particularly with new marriages, and I don’t want mine to cave under this pressure. My fiancé keeps trying to convince me that it’s perfectly fine and normal for her mom to live with us. This is my moment to put my foot down, but I desperately fear my fiancé will choose a life with her mom over a life with me. Help! Any experience or insight?