AITA for not helping my parents pay for my younger sister’s big birthday gift?

A teenage brother finds himself caught in the middle of a painful family dynamic when his parents ask him to help pay for his younger sister’s birthday gift. The request comes after a household emergency drained part of the budget, but what makes the situation more complicated is the long history of tension, cruelty, and unresolved conflict between siblings.

As emotions resurface, the disagreement quickly becomes about more than money. It raises uncomfortable questions about responsibility, accountability, and whether forgiveness should be expected when harmful behavior continues unchecked. The story has sparked intense debate online, with many readers focusing on parental responsibility and the lasting impact of sibling bullying.

‘AITA for not helping my parents pay for my younger sister’s big birthday gift?’

The conflict begins with a close bond between siblings and a deep rift with another.

I (17m) have two younger sisters. Ava (15f) is younger and Rhea (14f) is the youngest. Rhea and I are really close and I'd do anything for her, anytime.

We can annoy each other and sometimes we fight but she's one of my favorite people. We're the closest in our family by far. I can't stand Ava. Rhea wishes...

What makes the situation more complicated is a pattern of repeated cruelty and humiliation.

Sometimes it's like Ava wanted to be an only child. She's worse toward Rhea which bothers me more than if she was that way with me. But she can also...

Sometimes it's annoying little kid things. But she's also quick to be more cruel. She can go from hiding my phone somewhere and refusing to tell me where it is...

to ruining my homework because I wouldn't "help" with hers, which is code for doing her homework for her. One time she deleted my entire finished essay because I wouldn't...

Another time she spilled water all over my assignment sheet. When we were younger it was worse because we got a lot of handouts and it was easier. With Rhea...

She tries to humiliate her by telling kids stuff that Rhea did that others would make fun of her for, like when she used to have accidents when we were...

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Ava also outed Rhea as a lesbian before Rhea wanted to be out. Ava wasn't even told. She heard Rhea and me talking and decided to spill to people.

The breaking point comes when money, expectations, and unresolved resentment collide.

Our parents discipline Ava and they try to make it up to us. But I know they expect forgiveness when Ava doesn't ask for it and that's where this comes...

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The big one always takes priority. Ava's birthday is in a couple of weeks and they had to spend a portion of the money set aside for her big gift...

So they asked me if I would share the cost with them so Ava can still get her big gift. They know I have a job and that I save...

My parents told me they know we have our issues but she's still my sister and they said I will make things worse if I don't do this for her,...

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and she definitely doesn't deserve it from me. My parents said they'd give me the money back in $50 each week and I said no way again.. They told me...

At its core, the issue is not about a birthday gift but about long-term behavior patterns that have never been meaningfully resolved. Ava’s repeated actions toward both siblings go beyond typical sibling rivalry and into sustained harassment, which can leave lasting emotional harm. Expecting forgiveness without accountability often reinforces the behavior rather than correcting it.

From another perspective, the parents may feel overwhelmed by financial stress and eager to preserve family traditions. However, asking a 17-year-old to subsidize a non-essential expense shifts adult responsibility onto a child who is already navigating emotional strain at home. That expectation risks normalizing the idea that harmony should be bought rather than earned.

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Socially, the broader implication centers on how families handle harm within the household. Protecting one child’s comfort at the expense of another’s well-being can fracture trust for years. Accountability, consistent boundaries, and meaningful intervention matter far more than maintaining appearances. Without those steps, resentment often becomes a rational response rather than a grudge.

Here’s what Redditors had to say:

Many users supported the decision, focusing on parental responsibility and the impact of bullying.

snarkness_monster − So they asked me if I would share the cost with them so Ava can still get her big gift. Even if we ignore what a bully Ava...

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You're a child yourself. They know I have a job and that I save money. Yes, but unless it's an absolute emergency, your parents shouldn't ask you for any money....

They told me they were disappointed I would hold such a grudge against my little sister. "I'm disappointed you've failed at parenting and allowed Ava to bully Rhea and me...

I'm also disappointed you are relying on me, a 17YO child for money for another child's gift and trying to manipulate me into giving you the money.

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This isn't a grudge, and her treatment of us, together with your validation of her behaviors, will affect us for life. I will not now, or ever, give you money...

Tenacious_Marie − NTA.  You're not obligated to financially support your sister's gift, especially given her history of mistreatment towards you and Rhea.

Your parents can't expect you to prioritize Ava's desires over your own feelings and financial well-being.  It's their responsibility to manage their budget and find solutions within their means.

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BENSLAYER − NTA - your parents are not doing enough to hold Ava to account, they are allowing Rhea (and you) to be bullied by her.

Tell them that *you* are disappointed in *their* lack of action, that it is their fault for not parenting her properly that you "hold a grudge".

That Ava is an extremely cruel person who gleefully put Rhea in danger, ruining her life both at home and school. What happens when Rhea is assaulted (in any way)...

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How are they going to "make it up to her" for depression, anxiety and childhood trauma that is the common result of what Rhea has endured?

There is no "making up for it" later, this causes permanent harm to a person and they are handwaving it away. Why do they feel comfortable having their other children...

Remind them that they are the parents, that it is *their responsibility* to sort this out, *not to demand a forgive and forget attitude that leaves Rhea suffering*.

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Point blank tell them that you would help Rhea because she is a good kid, who behaves like a sister, and needs additional support from you *since her parents allow...

Be clear, it is *their* problem to deal with and the plumbing leak only highlights an already present problem - they expect everyone to either pretend away issues or help...

Their "passive approach" is actually tacit support for Ava's actions, you will not pretend for them. * If the "punishments" that they are handing out do not work,

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then they need to more actively monitor/work with/punish her instead of immediately expecting forgiveness and *repeatedly* leaving you both to wait for Ava's bullying to happen again.

Your parents know it will continue to happen, it is easier for them to allow it to and ask forgiveness afterwards than actually prevent the harmful behaviour in the first...

I am sorry but your parents are A Hs, (as is Ava), they make the deliberate choice to let you two be bullied since it would inconvenience them to actually...

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Simply put, they value their own comfort and desires over the the wellbeing of you and your youngest sister. * I am so sorry, at 17 years old you should...

You are working at that age which means you are willing to put in the effort to start building a future - your parents should not be guilt-tripping you to...

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and is not *your* responsibility. From my outside perspective, it appears that they really do not want to deal with the difficulties of parenting, they only want to be involved...

I highly suggest speaking to other adults that you trust, this is not simply "sibling rivalry", "normal teenage behaviour" or whatever excuses are made for Ava.

Do you have any trustworthy family members that you could contact for advice/support? Would you be able to speak with your educators for guidance? Also, have your parents ever dealt...

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I have a feeling that they are not very proactive, trying to force it to be smoothed out at home and ignoring anything outside of that. Good luck to you...

Kufat − NTA. Why is Ava even getting a birthday gift if this is how she behaves?

Intelligent_Shine_54 − It's not a grudge if a bad sister continues to terrorize her sisters without remorse. Nta.

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Maybe your parents should invest money in getting Ava a therapist to get over her issues she has with you and your sister because her behavior is troubling.

Others offered balanced takes, acknowledging tradition while defending the right to refuse.

BeMandalorTomad − NTA Rhea sounds amazing. I’m glad she has you looking out for you. As for your parents, I can understand why they asked.

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Tradition to uphold but bills to pay. But they *asked* bc it is your money. You have every right to say no for any reason at all, and you have...

LCJ75 − How expensive are these gifts that they can not afford to buy them if a household emergency comes up and needing to replay $50 a week! ?

I can maybe understand for a milestone birthday but every year? NTA but your parents are for asking you to do this, allowing one child to bully others.

A few comments used blunt humor and direct advice to ease tension.

11SkiHill − Hold your grudge. Tell little sister if she does not improve she will be very lonely later. ... because no one has to put up with her once...

And tell your parents it is their responsibility to provide for their kids. Not yours.   Never tell them how much you have saved or allow them access to your accounts.

[Reddit User] − NTA - for refusing to fund Ava's birthday gift, given her persistent bullying and lack of remorse toward you and Rhea. Your decision reflects a justified stance...

It is incumbent upon your parents to address the underlying issues in family dynamics rather than pressuring you to compensate for their financial shortfall.

EweCantTouchThis − Your parents are financially irresponsible for getting themselves into this predicament. NTA

This story reveals how unresolved family issues can surface in unexpected ways, especially when money and expectations collide. The refusal to contribute was not rooted in spite, but in years of unaddressed behavior and emotional harm.

Should teenagers ever be expected to financially support family traditions? Where should parents draw the line between maintaining peace and enforcing accountability? And how can families address sibling bullying before it causes permanent damage?

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