AITA for Moving in with My Dad Full Time After My Mom Moved in with Her Partner and His Kids?

When my mom decided to blend families with her new fiancé, I was supposed to share a bedroom with his 15-year-old daughter. I refused — and now she says I’m spoiled for choosing to live with my dad instead.

I’m 16F, and my parents have been divorced for years. Mom recently moved in with her partner of three years. They bought a house together and are planning to get married. Before the move, I shared a room with my little sister (10F) and my brother (12M) had his own room. It wasn’t ideal, but it worked. When Mom’s partner’s 15-year-old daughter entered the picture, everything changed. Because her partner’s other kids are boys, they didn’t want his daughter sharing with them. Mom decided that meant I’d be her new roommate.

I’ve shared rooms my whole life — but never with a stranger who was forced on me.

I told Mom I didn’t want to share with her fiancé’s daughter. I don’t dislike her — I just don’t know her like that. I suggested switching arrangements or even all three of us siblings sharing temporarily, but Mom said there wasn’t enough space. She told me I’d “get used to it” and that it would prepare me for college roommates. But I’m not even going to college — I’m doing a trade. And even if I were, it’s different when you choose to share with someone, not when it’s forced.

“I’m not refusing to share a room — I’m refusing to share it with someone I barely know.”

I reminded Mom that under their custody agreement, once I turned 16, I could choose where I wanted to live. I told her I was going to live with Dad full time. She didn’t take me seriously — until I didn’t move any of my stuff into her new house. I still visit her sometimes, but I don’t sleep over anymore. Dad completely supports my decision. Mom, not so much. Her fiancé is angry too, mostly because now his daughter doesn’t have anyone her age around. They act like I’m the problem for not wanting to be her built-in best friend.

“I told them I’m not there to be her entertainment — I’m there to be with my family.”

Mom gave me an ultimatum: move in with her or stop living full time with Dad. I didn’t budge. She called me spoiled and entitled, saying I’ve always shared a room and it’s no big deal. But it is. I’ve always shared with my siblings, not with a stranger I didn’t ask for. She cussed out my dad for “allowing” it, but she can’t do anything about it — the custody agreement gives me the choice.

🏠 The Aftermath

Now I live with Dad full time. It’s peaceful — I have my own space, and no one’s trying to guilt me into being someone’s built-in companion. Mom still calls, sometimes crying, sometimes angry, saying I’m “breaking up the family.”

Her fiancé barely talks to me when I visit. Apparently, his daughter feels awkward that I don’t live there, and my mom keeps using that to guilt-trip me. But it’s not my job to fix their blended family’s chemistry — I didn’t choose this setup.

I still love my mom, but I need to live somewhere I feel comfortable and respected. And right now, that’s with Dad.

You can’t guilt someone into being family — it has to be earned.

Mom says I’m stubborn. I say I’m setting boundaries. Maybe that’s the difference between being a kid and becoming an adult.

💭 Emotional Reflection

Blended families are hard — but respect has to go both ways. My mom wanted everyone to merge seamlessly without asking what I wanted or needed. I wasn’t refusing her relationship; I was refusing to lose my comfort and privacy for it.

At sixteen, I’m old enough to know what makes me miserable and to say no to it. Living with Dad doesn’t mean I don’t love Mom — it means I’m choosing peace. She can call it spoiled, but sometimes choosing yourself is just self-preservation.

This isn’t rebellion. It’s boundaries — something my mom still doesn’t understand.

Here’s how readers responded to her story:

NTA. You didn’t reject your mom — you rejected an uncomfortable living situation. That’s valid.

She made a new family without asking how it would affect the old one. You made your choice — and it’s your right.

At sixteen, you’re setting boundaries adults struggle to make. Don’t let anyone guilt you for that.

Most commenters agreed: she wasn’t wrong to live with her dad — she was wronged for being pressured into a situation she never agreed to.

🌱 Final Thoughts

Growing up sometimes means saying no to things that make you uncomfortable — even when it upsets people you love. It’s not selfish to choose where you feel safe.

Your mom built a new life; you’re allowed to choose where you fit into it — or if you fit at all.

What do you think?
Was she justified in living with her dad full time, or should she have given her mom’s new family a chance? Share your thoughts below 👇