AITA - Critiquing the parenting style towards my sister

My (24) younger sister (18) recently got suspended from school in the UK for buying alcohol for herself and friends (17) and consuming in the park on Saturday while under the care of boarding.

There have been meetings with my dad, step mom, aunt, uncle, step sister, and my sister to explain the situation and move forward. She then got sent a document (below at the end of this post).

I made a group chat with her, my dad and my step mom and replied with this: Sorry but what is this??? She made an honest mistake with no malicious intent and now has the weight of her entire family and a 900 word document outlining 10+ separate punishments, numerous very serious ultimatums, and threatening that we will not have her back emotionally or financially if she makes another mistake. If I received this, I would completely withdraw from everyone who had a part in writing it. I am strongly against personal growth in the form of fear from under performing, making another mistake, and being cut off from family support. Please reshare to any writers after having taken out the word 'brothers' out of it, I do not want to be in this document if it implies [sister] can never and should never inconvenience me or do anything that'll make me feel concern. That is what family is for!

There were many messages exchanged, TLDR they have said I don't see the full picture and it's for her benefit, I have said regardless of what I'm missing, this is not the way to go about it. My dad has thrown around the word liar and insular to describe sister, my step mom has critisied her of having her moms genes. I am now not on great terms with both my dad and stepmom. Aunt has told her: if anything should happen to my brother or if he should have a heart attack from the stress you have caused I will hunt you down

Note: my sister has been caught in lies during bigger incidents during high school such as getting caught smoking weed and getting caught taking out and scraping the entire side of the car. But in my opinion, she is a completely normal and determined young adult.

--- Document below ---

[Sister],

The conversation we had earlier today isn’t about punishment. It’s about us helping you take the next steps toward becoming the young adult you’re meant to be. We love you, and we want to support you—but that support must be matched by effort, reflection, and respect.

You’re at a turning point, and how you move forward matters. This summer is your opportunity to reset, rebuild trust, and show us who you’re becoming.

1. Understanding the impact of your actions

Your suspension from [school name] Boarding and your behaviour at school carry real consequences—not just for you, but for the people who care about you.

Personally:

• Many of us—[Step-Mom], [Aunt], [Uncle], [step-sister], your brothers, your cousin, and me—were inconvenienced and deeply concerned. • It’s not just about embarrassment. It’s about time, love, energy, and money invested into your life and growth—and how your indifference can make that feel disregarded. • A suspension may affect future opportunities: university applications, references, and how others perceive and interact with you. • The lack of spoken remorse is worrying—not because of the mistake itself, but because it suggests you haven’t yet connected your actions to their wider impact.

Family-wise:

• Your relationships are at risk of damage. When trust is broken and not repaired, people pull away. • If there’s no real consequence, it can send a dangerous message to you that poor decisions don’t matter.

Legally and socially:

• At 18 years old, your decisions are legally your own. • But, you’re still socially and financially dependent on us—and that connection means we have a role in how things go from here.

2. Summer Plan — A fresh start

Before you return to [school name], we’re setting some clear expectations. This isn’t about control—it’s about structure, responsibility, and earning back trust.

What we expect:

• Respect the home: This is not a hotel. You’ll contribute to daily chores and responsibilities as we all do and have to do. • Make amends: We’d like you to write or meaningfully express an apology to [Step-Mom], [Aunt], [Uncle] and [Cousin]. Words matter when they’re backed by thought and effort. I’ll send you an example to assist you. • Daily routine: ◦ 3 days a week: work at [dads company](8/9am–3pm). Actual working days to be decided. ◦ 2 days a week: volunteer work with [family friends]. We will chat about this over the next few days. ◦ Curfews, screen time, and phone use will be managed to keep a healthy balance.

Earning back trust:

• You’ll be allowed the 6 days with [long distance boyfriend] whilst he is in [home country] in August—but only if the expectations are met. • No [country-wide festival] or night events, any other evening outings this summer unless inititiated by [Step-Mom] and/or me. • No going by [boyfriend]’s house or going out from our home. • [boyfriend] gone by 8pm. • We’ll be looking for: ◦ Help around the home ◦ Participation in family or volunteer projects ◦ A written reflection on what the suspension means and what you’ve learned • If things go off-track (lying, bad attitude, skipping responsibilities), privileges will be reduced—including financial support and post-summer plans.

Ongoing check-ins:

• Every 2 weeks, I’ll speak with [school name] boarding and schoolabout your progress. • One more serious issue, and you will be pulled from [school name] for the first and last time. After that, you’ll be responsible for outlining your next step—either [school program] online or employment. We will not fund [school program] or other studies at [home town schools].

3. A Message to You, [Sister]

“You’re now at an age where your actions reflect on you. We’re not angry about the boarding suspension—we’re disappointed in your indifference, poor choices, and lack of awareness. Respect isn’t just about obeying rules—it’s about recognising how your behaviour affects the people who love and support you. This summer and last year at [school name] is your chance to show us and yourself who you’re becoming. We’ll support you—but we will not carry you.”

4. After Summer — What Comes Next • If behaviour doesn’t change, [school name] will no longer be an option. • You are not to room with [best-friend1]. I have advised [school name] of this. • We strongly suggest you are pleasant with [best-friend1] and [best-friend2] but move yourself along from their influence. • Try and build relationships with others. Both Boarding and we can assist you in this if you wish? • We’ll help you plan next steps for the next 5 months and on (university, gap year, work), but support—both emotional and financial—will depend on your effort and responsibility. • I believe you have to make UCAS applications in the UK by end of October 2025? If this is your chosen path? • If you choose freedom, that comes with accountability. If you burn bridges with us, we won’t protect you from those consequences.

5. Final Thought

This is a moment to shape your future—not just avoid trouble. You have every opportunity to grow, build trust, and become a young woman we can all be proud of and you be proud of yourself. We’re doing this because we care, not because we’re angry. Love without boundaries isn’t love—it’s neglect. We’re offering support with structure, compassion with accountability.

The rest is up to you.