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Little Sister Opened Her Birthday Present Early—When She Tried To Set A Boundary, Everyone Turned On Her

by Layla Bui
October 29, 2025
in Social Issues

Siblings often test each other’s limits, but some lessons can’t be taught through sharing alone. One woman thought she’d grown used to her little sister’s habit of treating her things like community property until it started ruining special moments.

After discovering that her 13-year-old sister had opened one of her birthday gifts and used it before she did, she decided enough was enough. But when she tried to stand her ground, her family accused her of being harsh and unkind. Reddit, of course, had a lot to say about that.

Let’s check the story now:

Little Sister Opened Her Birthday Present Early—When She Tried To Set A Boundary, Everyone Turned On Her
not the actual photo

'AITA for trying to set a boundary with my little sister after she opened my birthday present?'

23F, little sister is 13F. I live back & forth between my mum’s and my dad’s house.

All of my siblings are half-siblings on my dad’s side.

I love my little sister but lately I've been getting annoyed about certain boundaries she crosses.

She’s obsessed with face cream, hand cream, body spray, perfume, any hair products that smell good, lip gloss/balm,

she has a very big collection of all these things.

I once sat and counted how many lip stuff she has accumulated over the years and I counted 37.

Despite having TONS of her own, she always asks to borrow mine and often ends up using up the entire thing

(one of my perfumes was almost completely used up because she would spray it at least 20 times every time she used it)

She gets upset if I don’t share my stuff with her.

For example, I got a body mist from Bath & Body Works recently because I loved the smell.

I decided to leave it at my mum’s house.

My sister saw it in the background during a facetime and said “oh that looks like it smells good.

Can you bring it the next time you come here?!”

and I jokingly said something along the lines of “I think we’ve got more than enough perfumes at dad's”, and she was visibly upset.

I’m quite a patient person so I brush all of this off bc she’s my lil sister and that's just what siblings do, right?

But this recent situation has really upset me and I don’t know if I’m overreacting or not.

So: It was my birthday on Tuesday. I went to my dad’s to celebrate after work.

When I sat down to open presents, I noticed that all of them were intact except one,

of which whose packaging had been ripped open and the contents removed.

Hm, weird, so I asked my little sister what happened and she told me that it was one of my brother’s gifts to me

(a set that included hand cream, a nail file, a nail/cuticle oil, and a little nail clipper)

and she “really wanted to try it” and couldn’t wait for me to open it

so she decided to go ahead and open it herself and try everything out.

Half the hand cream had been squeezed out of the tube, the nail file was used

because it had those telltale scratches on it,

and the small nail/cuticle oil bottle wasn’t closed properly so it was also opened.

I understand that, in the grand scheme of things, this isn’t a big deal,

but it made me sad that she had just gone and opened my gift like that without even thinking to consult me first.

I said to her, verbatim, “You need to stop thinking all of my things are automatically yours too.”

Her mum taught her that everything that belongs to your siblings also belongs to you.

Her philosophy: siblings share everything. So, setting a boundary is very difficult;

My sister got mad because I “never share” my things with her anymore

and am “purposely” leaving some of my stuff at my mum’s place to avoid her using them.

Her mum called me “quite selfish” for belittling my own sister for wanting to be “closer to me” by borrowing my things.

AITA? WIBTA if I continued to be harsh about these boundaries?

Setting boundaries with siblings is an essential part of fostering respect and healthy relationships, especially as children enter adolescence.

Experts in child development emphasize that teaching children to respect other people’s belongings helps them develop empathy, self-control, and social responsibility (American Academy of Pediatrics: Sibling Relationships).

In this scenario, the 13-year-old repeatedly accessed her older sister’s personal items without permission, including a birthday gift, which represents a clear violation of boundaries.

Allowing this behavior to continue unchallenged can create a pattern of entitlement that may affect her interactions with peers and family members.

Adolescence is the period when children are developing a sense of personal autonomy and learning the consequences of their actions.

Parents and older siblings can model respectful behavior by setting clear limits on borrowing and usage, as well as by explaining the reasons behind these rules.

According to parenting specialists, it is appropriate for older siblings to assert their boundaries firmly, while simultaneously teaching the younger child about respect, negotiation, and fairness (Child Mind Institute).

In this case, the older sister’s response, directly addressing the unauthorized use of her gift, aligns with this guidance, as it communicates ownership and accountability.

It is also important for parents or guardians to reinforce these lessons consistently. If the younger sibling’s mother promotes a “everything belongs to siblings” philosophy, this can undermine boundary-setting and lead to conflict.

Experts suggest that parents should clarify exceptions and explain why certain personal items are off-limits, encouraging the child to ask before taking or using something that isn’t theirs.

This ensures that boundaries are understood and respected, rather than ignored (Verywell Family).

These are the responses from Reddit users:

These Redditors criticized the parents for poor discipline

Ok_Expression7723 − Where is your dad in all of this? Why isn’t he parenting her? Get a lock for your door.

She has lost all privileges in your room, lost access to any of your stuff, and she should be grounded.

Her allowance should be going to you until she’s paid for the birthday present she stole and ruined.

This behavior is completely unacceptable.

Your dad and his wife are doing her a massive disservice by not setting clear and enforced rules of behavior.

They are also treating you horribly. This was your present. Not hers. She stole it. None of her behavior is ok.

Dittoheadforever − You're NTA. Your sister is old enough to understand that she shouldn't be stealing other people's belongings.

Her mother is doing her no favors by teaching her otherwise.

Her mum taught her that everything that belongs to your siblings also belongs to you.

Her philosophy: siblings share everything.

Funny, I didn't notice you saying that her mother taught her everything that belongs to your parents also belongs to you.

CPolland12 − NTA - You said “in the grand scheme of things this isn’t a big deal” but it is. It’s a huge deal.

Honestly how would she feel if you opened and used her birthday presents before she got to them?

How would her mother feel? This needs to be nipped in the bud

This group argued that boundaries mean nothing if the parents don’t enforce them

Resilient_Knee − Obviously NTA, but you should probably either stop living there

or start keeping all your stuff at the other house if the parent is encouraging her behavior,

it doesn't really matter what boundaries you set because I doubt she'll listen

__The_Kraken__ − She’s 13, not 3, old enough to know she needs to respect others’ belongings.

Her mother is doing her no favors by raising her daughter to be an entitled brat.

Does she have lots of friends, or does she have difficulty maintaining friendships?

You are NTA and I would spend less time at their house.

She needs to learn that these actions have consequences

and it is clear that her mother is not going to be the one to teach her.

Trespassingw − NTA, of course. This is not borrowed - it's stolen and used without permission.

Moreover, this is ruined the gift to other person from other person. Awful.

You are too soft, not close to harsh. That girl is a spoiled brat and her mom is making her worse.

These commenters agreed the OP was right to be firm

lemon_charlie − NTA. 13 is old enough to learn boundaries.

Wonder how she'd feel if you helped yourself to her supply, because siblings share everything apparently.

residentcaprice − You should get stepmom some hand creams for holiday gifts

and encourage little sis to get in there. Because "family".

ThrowaMac1234 − NTA. That poor little girl is going to have an awful awakening someday.

Hopefully before college. I had a college roommate like her and it was hell.

Then it got loud. As in we all put her in her place, loudly and right away. It wasn't pretty and she shed a lot of tears.

cinnamonoblivion − NTA but why do you seem like you’re ‘scared’ of her?

First of all, she’s 13 and you’re 23, YOU’RE the big sister, don’t beat around the bush,

use your big sister voice/abuse your older sibling powers idk.

“No I'm not bringing my perfume to dad’s house, it’s not for you, (insert typical sibling insult)!”

“I don’t care what your reason was, don’t touch my stuff.”

“I don’t share with you because you take everything and use most of it.”

“I don’t have to bring stuff to dad’s just because you want it, it’s mine.

I don’t care.” Or better yet, start taking and using her stuff and see how she likes it. I bet she won’t be so open to sharing.

But what’s your take? Was OP right to draw the line and finally say “enough,” or should she have been gentler given her sister’s age?

Have you ever had to set a boundary that your own family refused to respect? Drop your thoughts below!

Layla Bui

Layla Bui

Hi, I’m Layla Bui. I’m a lifestyle and culture writer for Daily Highlight. Living in Los Angeles gives me endless energy and stories to share. I believe words have the power to question the world around us. Through my writing, I explore themes of wellness, belonging, and social pressure, the quiet struggles that shape so many of our lives.

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