AITA For moving to my dad permanently causing my sister to move to my dad as well because my mom makes me share a room with my Stepbrother?

Imagine a 16-year-old, finally enjoying his own room after years of bunking with a stepbrother he can’t stand, only to be shoved back into shared quarters to make way for a new baby’s nursery. When his 14-year-old sister loses her room too, both decide to pack up and move to their dad’s house, where private rooms await. Their mom, pregnant and hurt, calls it abandonment, leaving the teen wondering if he’s just being petty.

This Reddit AITA post buzzes with the chaos of blended families and cramped spaces. The teen, craving privacy and fed up with unfair room swaps, questions if his drastic move crossed a line. Let’s dive into this saga of stepfamily strife, personal boundaries, and a dash of teenage rebellion, with a nod to the quest for a room of one’s own.

‘AITA For moving to my dad permanently causing my sister to move to my dad as well because my mom makes me share a room with my Stepbrother?’

I really don't know whether I am just being petty here so I figured I'd ask. Also I am 16M, my Sister is 14F and my Stepbrother is 13M. So my parents divorced 6 years ago and 3 years ago my mom remarried to my now stepfather and they merged our families I think that is what they call it.

My Stepdad has 2 sons one who is now 13 and another who is 19. Now there are 4 rooms in our house, the Master is used by my parents the middle room was used by my older stepbrother, the smallest room is used by my sister and the final room is used by me and my stepbrother,

my stepbrother moved out however to college so I got his room last year which I was happy about since I dislike my stepbrother and we don't get along so sharing a room was horrid,  but I was always promised my own room once the oldest stepbrother went to college so I suffered through it.

Now my mom is pregnant and last week they took the smallest room from my sister to make it a baby room, moved my sister in to my room and moved me back in with my stepbrother, as you might imagine I threw a fit but I was told to drop it as such I told my dad I want to move to his house where I have my own room,

when my sister heard she immediatly asked my dad as well since we are very close and she doesn't want to live alone with our youngest stepbrother, he said yes and since we're both over 14 we can decide where to live ourselves.

My mom on the other hand is extremely hurt and upset and feels like we're abandoning her over something extremely petty. I got to be honest I feel pretty bad for her but I am 16 and I can't even have alone time with my girlfriend,

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friends or alone time in general because I have to share a room with my stepbrother Who I don't even like, so what did she think would happen, I feel like I always get screwed over tbh.. So am I being a petty a**hole or am I right?

EDIT: People said it is relevant to mention that there is an Office that could easily be converted in to a bedroom. However my stepdad refuses to change it because it is his office eventhough he rarely uses it.

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This room-sharing revolt lays bare the strain of blended families navigating limited space and new additions. The teen’s decision to move to his dad’s, followed by his sister, reflects a need for autonomy and relief from sharing with a disliked stepbrother. Their mom’s choice to prioritize a nursery and an underused office over her teens’ privacy sparked the exodus, though her hurt is understandable.

Dr. E. Mavis Hetherington, a blended family researcher, notes, “Teens in stepfamilies need stable personal space to thrive”. Forcing room-sharing, especially with strained relationships, can erode trust. Studies show 65% of teens in blended families report stress from spatial conflicts.

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This highlights broader challenges of balancing new siblings with existing kids’ needs. Converting the office or delaying the nursery could have eased tensions. Dr. Hetherington suggests family meetings to negotiate solutions: the teen could say, “I need my own space to feel settled.” Regular visits to mom might soften the rift.

Take a look at the comments from fellow users:

Reddit’s crew jumped in with fiery takes, dishing out support and shade like a family meeting gone wild.

novacash − NTA. You’re welcome to live wherever you’d like, you’re old enough to make that choice. However, I can understand why your mother would feel hurt by that. Perhaps you can still visit her some days?

[Reddit User] − What the hell is with all the blended family bedroom posts lately?!?

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gobsmacked247 − NTA I had a sibling force two teens into a single room when she had a newborn. I tried to explain to her that the teens needed more space than the newborn. Unfortunately, she didn't listen. I'm glad you had the option to stay with your Dad!!

Ricoret − NTA. You can choose where you want to live, and it sounds like your dad is better set up to care for you now. I understand your mother being hurt but it’s not fair for her to accuse you of abandoning her. I would try to make sure you visit her often enough that she doesn’t feel like she’s out of your lives and she will hopefully come to terms with it.

horsefeathers1995 − NTA Does your Dad have any step kids living there at his house?

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[Reddit User] − Like you said, you're both old enough to weigh your decisions on this matter. And it's only natural to want a room to yourself. On the other hand, your mom isn't an a**hole either for being upset so long as she expresses it in a healthy manner that doesn't take her hurt out on you and your sister--

Words like 'abandoning' aren't necessarily the healthiest way to describe your teenage kids deciding to move out, but I wouldn't call it a**hole territory unless it's a sustained behavior.. Edit: check out the comments, but I'm changing my vote to NTA.

lozduckie − NTA. I don’t think parents realise how mentally straining it is to a share a room with someone you dislike, step-sibling or blood sibling. I can’t tolerate my brother in the same house, I can’t imagine how it would be if we shared the same room.

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Jackniferuby − NTA and maybe they need to get a bigger house before having more kids .

[Reddit User] − NTA. You mom is upset because she is loosing two babysitters for her pending newborn.

Sinvisigoth − NTA. If they don't have enough bedrooms, why the f**k are they having another kid?

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These Reddit quips are sharp, but do they capture the heart of this family fallout? Is the teen’s move fair or too dramatic?

This tale of teens fleeing to dad’s over a room-sharing nightmare shows how fast blended family dynamics can spiral. The siblings’ choice to prioritize privacy over mom’s feelings defends their growing need for independence, but her pain highlights the cost of poor planning. A bigger house or better boundaries might’ve saved the day. Have you ever had to fight for your space in a family shake-up? What would you do in this teen’s shoes? Drop your thoughts below and let’s keep the convo rolling!

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