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Spoiled Autistic Stepsister Throws Tantrums, Potentially Ruining Teen’s Sweet 16, Gets Excluded In Resentment

by Jeffrey Stone
December 2, 2025
in Social Issues

It can be difficult to put up with an autistic siblings sometimes. But what if the sibling is somewhat functional and use their autism as an excuse to throw tantrums whenever they don’t get what they want?

A teen’s Sweet 16, with 90 guests, a zoo vibe, and a dream car gift, nearly derailed by a family showdown. This Redditor’s planning a bash with her dad’s crew and pals, but her autistic stepsister, known for epic party-wrecking tantrums, didn’t make the cut.

The story results in a family drama, with her mom slamming her as an “uncaring brat.” Caught between a mountain cabin dream and family fallout, she just wants one meltdown-free day.

Is she selfish, or is her boundary fair?

15-year-old refuses to have her spoiled autistic stepsister at her birthday party, mom slams her badly.

Spoiled Autistic Stepsister Throws Tantrums, Potentially Ruining Teen's Sweet 16, Gets Excluded In Resentment
Not the actual photo.

'AITA for not wanting my autistic sister to come to my birthday party?'

I (15F) am turning sixteen soon and I’m having a pretty big party to celebrate.

I have a stepsister (16F) who is autistic. She is fairly high functioning but very spoiled and throws tantrums whenever she doesn’t get what she wants.

When I was little, she would always ruin my birthday parties so I stopped having parties with my mom’s family.

I usually have parties with just my dads family and my friends. This year, I’m turning 16 so I’m having a bigger party

which my dad is mostly paying for but I’m inviting my mom, stepdad, stepbrother and half siblings (13M and 11F).

I’m having a party with about 90 people and over the weekend my grandma is gonna take me and some of my friends and cousins to their cabin in the...

I do not want my stepsister to come to the party or to the cabin. I know she’s going to ruin it.

She gets jealous whenever I get anything and my dad is planning to gift me my dream car at the party so I know she’s gonna throw a tantrum.

She always steals the attention from me and I just don’t want her there. I’m not inviting her to the cabin either because it’s just for my cousins on my...

I’m not that close to my stepsister. Besides, we’re going to hike, boat, ride horses, and do other outdoor events that I know my sister can’t handle.

She’s gonna start crying if we try to go on the water and she can’t walk further than half a mile without getting tired.

Yesterday my stepsister told me that she’s really excited for my party because it’s at the zoo and she loves it there and she has never stayed in a cabin...

I told her that she’s not invited and she started crying and ran to her room. My mom called me an uncaring brat for not inviting her and telling her...

She said that her and my stepdad aren’t coming either if she’s not invited. I don’t think I’m the a__hole because it’s my party and I don’t want her to...

UPDATE: I don’t think my moms family is coming. My stepbrother is coming because he’s 18 and doesn’t care if my stepsis is invited and I wish my little siblings...

I might do a smaller celebration with just them, but I don’t have the money to pay for that myself so I can only do that if my mom pays...

Dealing with an autistic relative could be troublesome. In this case, a 15-year-old wants her Sweet 16 to be tantrum-free, but her autistic stepsister’s past behavior makes her wary.

Excluding her stepsister sparked tears and a parental boycott, leaving the teen caught between her dream day and family expectations.

It’s a classic clash of personal boundaries versus family inclusion, with everyone’s feelings on the line.

From the teen’s perspective, her stepsister’s tantrums, described as stealing the spotlight, justify the exclusion. Past parties were ruined, and the cabin trip’s outdoor activities, like hiking and boating, aren’t suited to her stepsister’s needs.

She’s prioritizing her joy, especially since her dad’s footing the bill. Yet, her blunt delivery (“you’re not invited”) stung, escalating the conflict.

Her mom and stepdad see this as cruel, arguing for inclusion despite the behavioral challenges.

Both sides have valid points: the teen deserves her moment, but excluding one family member risks long-term rifts.

According to a 2021 study by the National Autism Association, 1 in 44 children in the U.S. is diagnosed with autism, and family events often require tailored accommodations.

Siblings may feel overshadowed, as this Redditor does, when parents prioritize the neurodivergent child’s needs.

Dr. Rachelle Sheely, a family therapist specializing in autism, notes in Autism Parenting Magazine, “Siblings often feel invisible when a child with special needs dominates family attention. Open communication and clear boundaries can balance everyone’s needs”.

Here, the teen’s frustration suggests her mom and stepdad may lean too heavily on accommodating her stepsister, leaving her feeling sidelined.

Neutral solutions could bridge this gap. The teen’s idea of a separate family celebration is a start, but her mom’s reluctance to fund it complicates things.

A family meeting before invites went out might’ve softened the blow, setting expectations with empathy.

For future events, the parents could work with the stepsister on behavior strategies, like a quiet space at the zoo to manage overwhelm.

The teen could also reflect on how her delivery impacts her stepsister, who may not fully grasp social cues.

Both sides need to talk, not tantrum, to avoid a family fracture.

See what others had to share with OP:

kiwimuz − NTA. There is a history of her wrecking your special events. You have stated also why the cabin event is not suitable.

What or who made her think she was invited to either event?

[Reddit User] − NTA it is your party. Is it a great loss if your mum and stepdad are not there as well? Have a great birthday

PinkHairAnalyst − NTA. The assholes are your mom and stepdad. They clearly haven’t taught the autistic daughter how to behave at parties etc. where it isn’t all about her.

I’m willing to bet they’ve enabled her over her entire life. Stick to your guns, OP. It’s your party and if I were you, I wouldn’t want it wrecked either.

You only get one Sweet 16. Not to mention, it’s your bio dad who is paying for the whole shindig. You absolutely invite whoever you please.

EdwinaArkie − NTA. She’s old enough to have consequences for her actions. The actual A’s are her parents for letting her get away with that behavior.

Scaredfrogs − NTA you could have said it nicely but not necessary, blunt is good to make sure the message gets across. You should get to invite who you want...

shammy_dammy − NTA. Oh, no. Mom and stepdad aren't coming either? No great loss.

Other users suggest that OP should consider a separate family event, which includes the stepsister.

bergreen − As an autistic person myself, let me be the first to say NTA. Your birthday party is about you, not someone else.

That said, with comments like these: She is fairly high functioning but very spoiled and throws tantrums it sounds like you have a lot to learn about autism.

Obviously your step sister is not your responsibility, but learning would make your life (and everyone else's life) a lot less difficult.

Also excluding a close family member will likely cause lifelong problems. I don't think that's your fault, just want to prepare you for the reality.

Edit: Yes I know autistic people can be spoiled too, thanks. Someone else already said it, your comment isn't new so please don't post it.

magical_bunny − NTA. Maybe you guys could have a separate family dinner celebration or something and include her,

but by the sounds of it her behaviour can be difficult and your parents shouldn’t expect you to put up with that. Your birthday is about you.

Many users think OP is justified in excluding stepsister to ensure an enjoyable birthday.

kiwimuz − NTA. There is a history of her wrecking your special events. You have stated also why the cabin event is not suitable.

What or who made her think she was invited to either event?

[Reddit User] − NTA it is your party. Is it a great loss if your mum and stepdad are not there as well? Have a great birthday

PinkHairAnalyst − NTA. The assholes are your mom and stepdad. They clearly haven’t taught the autistic daughter how to behave at parties etc. where it isn’t all about her.

I’m willing to bet they’ve enabled her over her entire life. Stick to your guns, OP. It’s your party and if I were you, I wouldn’t want it wrecked either.

You only get one Sweet 16. Not to mention, it’s your bio dad who is paying for the whole shindig. You absolutely invite whoever you please.

EdwinaArkie − NTA. She’s old enough to have consequences for her actions. The actual A’s are her parents for letting her get away with that behavior.

Scaredfrogs − NTA you could have said it nicely but not necessary, blunt is good to make sure the message gets across. You should get to invite who you want...

shammy_dammy − NTA. Oh, no. Mom and stepdad aren't coming either? No great loss.

Other users suggest that OP should consider a separate family event, which includes the stepsister.

bergreen − As an autistic person myself, let me be the first to say NTA. Your birthday party is about you, not someone else.

That said, with comments like these: She is fairly high functioning but very spoiled and throws tantrums it sounds like you have a lot to learn about autism.

Obviously your step sister is not your responsibility, but learning would make your life (and everyone else's life) a lot less difficult.

Also excluding a close family member will likely cause lifelong problems. I don't think that's your fault, just want to prepare you for the reality.

Edit: Yes I know autistic people can be spoiled too, thanks. Someone else already said it, your comment isn't new so please don't post it.

magical_bunny − NTA. Maybe you guys could have a separate family dinner celebration or something and include her,

but by the sounds of it her behaviour can be difficult and your parents shouldn’t expect you to put up with that. Your birthday is about you.

Some people think excluding stepsister is fine, but OP should’ve discussed it with parents first.

Ace_boy08 − You are not the AH for not wanting her there. It's your party you can invite whoever you want.

You are the AH for how you handled things, but you're only 15, so your lack of maturity can be somewhat forgiven.

I think you should have sat down with your mother and explained the situation before giving the invite to them.

I can understand this being difficult to do. In general, you should have said that you don't want stepdaughter there because of all the reasons you mentioned in your post.

That it's your birthday party and you don't want the drama of a melt down because you got gifts.

That you are going to the cabin with your father's sides cousins and your friends only.

You are not friends with stepdaughter, and she won't be able to handle the activities you want to do for your birthday.

It's your birthday, and you just want it to be about yourself instead of accommodating activities for your step sister.

It was cruel to invite everyone in the family except her without having a discussion, but it is what it is.

If your mother chooses not to go along with the step family, then that is their right, as excluding a single family member has consequences I do think your mother...

The fact that you can't even have birthdays with your mother side is awful and that you still have issues at Christmas. I'm not sure on judgement, maybe NTA

Upsidedownmeow − NTA was not wanting her there. But YTA for inviting her whole family EXCEPT her without having a conversation first with the parents.

aGirlySloth − If for the past few years you’ve kept your birthday separate cause of your step sister, you should have kept it going for this one.

I don’t think you’re T A for not wanting her there based on history but you can’t invite everyone except her.

I think your mom is T A for not being more understanding of your feelings and that it’s kept you from celebrating on that side of the family.

At this point it looks like she’s reaped what she sowed with this whole situation.

Best outcome would be that your mom/step dad don’t come so that she won’t ruin it. I don’t think you’re selfish or a brat. NTA overall.

A user questions the stepsister’s behavior and parental responsibility.

whatever_787 − I’m not sure your sister is very high functioning. I am high functioning and don’t spit on things etc.

Maybe her parents need to set up some ground rules she has to follow.

This Redditor’s Sweet 16 saga is a wild ride. Zoo vibes, a dream car, and a stepsister showdown that’s got everyone talking.

Was she wrong to exclude her stepsister to protect her big day, or did her blunt approach light the fuse?

How would you juggle family drama while chasing a tantrum-free party? And is a separate celebration the key to peace, or just kicking the can down the road? Share your hot takes below!

Jeffrey Stone

Jeffrey Stone

Jeffrey Stone is a valuable freelance writer at DAILY HIGHLIGHT. As a senior entertainment and news writer, Jarvis brings a wealth of expertise in the field, specifically focusing on the entertainment industry.

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