A woman on Reddit feels insecure in her marriage after her mom admitted she wishes her son-in-law married the woman's sister instead.

The woman explained that her sister Fran and husband James were friends growing up, and James even asked Fran to the prom, even though she rejected him. After high school, James moved away for college and only came back during the holidays. The woman and James weren't friends growing up due to their age difference, but after college, she landed in the same city at James and reached out. The two became friends, fell in love and got married.

Meanwhile, two years ago Fran discovered her own husband was cheating on her for the whole duration of her marriage. "She decided to break things off. Fran moved back with my mom. Fran had not worked for the entire duration of their marriage and was expecting to gain significant alimony from the divorce. However, due to complications regarding prenup, she barely got anything and is struggling financially," the woman wrote.

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Since then, she and her husband have been helping Fran out during hard times. However, Fran and James' "special bond" and "inside jokes and stories" are starting to wear thin, especially since Fran often sleeps over.

"I don't mind her coming over, but I do not like the fact that she talks more to James than with me. Also, she always comes over when I am not at home, and I often find them sitting next to each other on sofa and watching TV when I get home. It sort of reminds me of my childhood where I was locked out of our basement when Fran had friends over, and I would feel left out. Fran is also too comfortable around James and walks around the house in just a towel after her shower when James is around, or sleeps in her underwear in the guest room without locking the door," the woman explained.

Though she has voiced her "concerns" to both her sister and husband, they haven't changed their behavior. In fact, recently at dinner with Fran and their mom, her sister wouldn't stop talking about her husband.

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"She said 'He was so much in love with me, and I felt guilty taking advantage of him.' My mom jokingly said to her that I wish you had the wits to marry James than your loser husband and you would have not been in this situation. Fran smiled after hearing that and nodded, but I was hurt by the comment. I protested to my mom that James is my husband, and I do not want her to make such comments about him. My mom doubled down and said that she feels like it because both James and I are high earners, while Fran is struggling. So, it would make sense if Fran was married to James, and I would be fine since I do not need James to support me financially," the woman shared.

Despite confronting her mom and sister, Fran told her to stop being so sensitive and argued it was just a "harmless joke."

"However, I had a fight with both of them, and I left. When I came home, and told James, he also sided with my mom and Fran and told me that her mom just made a harmless joke. I also raised the issue of Fran's behavior around our house, and he told me that this is between me and my sister, and he is not going to tell Fran about what she can or cannot wear in our house," the woman continued, concluding that she now feels "insecure" and doesn't "feel right" about the situation.

READ MORE: Woman Suspicious Her Husband and Divorced Sister Are Having an Affair

Users sounded in the comments suggested the woman set some boundaries with her sister.

"I’m waiting for Fran to try to attempt something with your husband within three to six months. Also you need to tell her no more sleepovers or just showing up. And put some clothes on for God's sake. And this is a firm boundary. And no you don’t care if they think you’re overreacting, THIS is how it’s going to be," one person wrote.

"Setting clear boundaries is essential, especially with Fran’s behavior. You’re right to prioritize your comfort and your marriage. If she doesn’t respect your boundaries, it’s time to take a stand. You deserve to feel secure in your home," another commented.

"We can clearly see who the favorite daughter is," someone else weighed in.

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