AITA for refusing to share a room with my stepsister?

A 15-year-old girl on a soccer travel team joined a family spring break trip with her dad, stepmom, 13-year-old brother, and 9-year-old stepsister in a rented three-bedroom house. While she gets along okay with her stepsister, the younger girl is demanding—nightmares, long bedtimes, occasional accidents, and now bronchitis causing coughing fits.

Assigned to share a room, the teen enjoyed a solo night when the girl ended up with parents, but hated the early quiet hours and routine the next night. After accidentally waking her on FaceTime, she moved the girl’s things out and locked the door—sparking fury from stepmom, who skipped her game the next day.

‘AITA for refusing to share a room with my stepsister?’

The trip combined her soccer game with family vacation, including early and late days:

The first night went smoothly for her when the girl migrated:

Things escalated late:

Blended family vacations amplify normal irritations—sharing space with a younger, needy child tests patience, especially for a teen craving independence before a big game. The stepsister’s issues sound medical (possible enuresis, anxiety, respiratory illness), needing parental handling, not sibling babysitting.

Executing boundaries dramatically (moving belongings, locking out a child) escalates conflict and risks safety perceptions. Family therapist Dr. Joshua Coleman notes teens asserting autonomy often clash with parental expectations of “family first”—communication upfront (“I need sleep for my game”) beats reactive moves.

Resolution? Parents should prioritize the trip’s purpose (her soccer) and the sick child’s care without burdening the teen. A calm talk acknowledging her frustration while explaining needs could rebuild peace—plus, separate sleeping solved it practically.

Here’s the comments of Reddit users:

Opinions split: Many started NTA for not wanting to share/babysit, but flipped to YTA or ESH over waking the girl and dramatically evicting her stuff:

Several went full YTA for the execution and attitude:

Others landed ESH, criticizing parents more but calling out the dramatic response:

A few stuck with NTA, focusing on parents’ poor planning:

One shifted after seeing OP’s replies:

Mixed bag, but the dramatic lock-out and stuff-moving tipped many scales—reasonable to want space and sleep, but execution felt mean to a sick kid.

Blended families on trips are minefields—ever shared space with an annoying younger sib and snapped? Or felt forced into babysitting on “your” event? How would you redraw room assignments fairly? Spill the tea!