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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

For putting my foot down at my sister insisitng joint birthday for my daughther and her son?

75 replies

Meowmeowgirl · 17/01/2026 20:02

My daughter turning 7 and my nephew 11

I need an outside perspective on a family situation that has caused more conflict than I ever expected.

My daughter is turning 7. She shares the same birthday as her cousin, who is turning 11 years old. When they were younger, joint celebrations sometimes made sense. But as they’ve grown older, the age gap and needs are very different.
This year, my daughter is not having a class birthday due to finances, so I wanted to do something small and special at home just for her. A simple family celebration after school with decorations, cake, and food she loves. Nothing big just her day.

I was very clear that this was my daughter’s birthday celebration. It was communicated as such, including that there would be themed decorations(unicorn theme) specifically chosen for her. No joint celebration was planned or agreed upon.
Despite this, my sister assumed her child would also be celebrated during my daughter’s birthday. This included bringing a separate cake, candles, and opening gifts together. When I said this wasn’t what I had planned, I was met with long messages about prioritizing her child’s feelings and how he might be hurt.
I want to be clear: I care about my nephew. I don’t want him to feel sad. But I am not his parent I am my daughter’s mother. My responsibility is to protect her moments, memories, and experiences.

My nephew is older and is having his own class birthday celebration where he will be the center of attention. My daughter is younger and will not have that experience this year. That is exactly why I wanted this one day to be hers.

I offered compromises, such as gifts being brought separately, but I was not willing to turn my daughter’s birthday into a joint celebration again. Especially when past shared celebrations often resulted in uneven attention and memories that weren’t truly hers.
What hurt the most was being told this was “poor planning,” when no shared celebration was ever planned between us, last year there where no joint birtdhay and my daughter got her own birtdhay with me and her 2 grandparents.The expectation was created without my agreement.

I believe children don’t always need to be protected from every feeling of disappointment. Learning that not every event is about you is part of growing up especially when another child deserves their own spotlight.
In the end, my sister chose not to attend, which I respect. But I’m left feeling frustrated that setting a boundary for my child turned into conflict.
I don’t think it’s wrong to say that being born on the same day doesn’t mean sharing every birthday forever. Each child deserves their own moments, especially as they grow.
I’m open to hearing whether others think I was unreasonable but please understand, this was about protecting my child’s experience, not taking anything away from another. It was litteraly my mom who invited my sister and told me about it and i said okay nice, but then she made more out of it.

OP posts:
CloakedInGucci · 17/01/2026 20:05

YANBU, and I don’t understand how she could think you are. He is having his own party, and you are not suggesting that your daughter go along to that and have it be a joint thing.

jeremyclarksonsthirdnipple · 17/01/2026 20:07

Tell your sis to stop being ridiculous.And tell your mum never to do that again as its caused so much upset.

Foodylicious · 17/01/2026 20:07

I definitely agree you get tp do your own thing.

But I do think its unreasonable to invite her and nephew to yours on the actual birthday and not include him in the celebration - is it on the actual birthday?

NoisyMonster678 · 17/01/2026 20:08

You are right.

Don't be manipulated by your sister and put your DD first on her birthday, you are more than right to do this.

👍👍👍👍👍👍

Clementine12 · 17/01/2026 20:10

Why on earth would an 11 year old boy have a joint party with a 7 year old girl?!

PrizedPickledPopcorn · 17/01/2026 20:11

Actually YA a bit U. While it was your DD’s celebration, it was also on his bday, with his relatives and 11 is still quite young.

Don’t you think it would be a bit odd to sing happy birthday to her and blow out her candles, and ignore the fact it’s also his BDay? I mean, yes it’s her party, her theme etc. but he is right there and it’s his bday too. If his Mum had planned a tea party at hers, with all the relatives, would you have gone with your DD and joined in without doing anything about her BDay while you were there?

BendingSpoons · 17/01/2026 20:12

Did you expect your nephew to attend? I think it would be quite mean to expect him to come and celebrate someone else's birthday on his actual birthday. It's also tricky if you are asking the grandparents to pick celebrations, although that might be easier if the grandparents are celebrating with FN at his party.

If you didn't expect him and your sister to attend, or made it clear they were welcome to decline, then fair enough.

Meowmeowgirl · 17/01/2026 20:12

Foodylicious · 17/01/2026 20:07

I definitely agree you get tp do your own thing.

But I do think its unreasonable to invite her and nephew to yours on the actual birthday and not include him in the celebration - is it on the actual birthday?

Edited

@Foodylicious
Their birtdhay is on 21 january and my daughter birtdhay party will be 22 january so not on the aqtually day

OP posts:
BendingSpoons · 17/01/2026 20:13

Clementine12 · 17/01/2026 20:10

Why on earth would an 11 year old boy have a joint party with a 7 year old girl?!

I assume this is more of a family tea party.

BendingSpoons · 17/01/2026 20:15

Meowmeowgirl · 17/01/2026 20:12

@Foodylicious
Their birtdhay is on 21 january and my daughter birtdhay party will be 22 january so not on the aqtually day

Seeing it is not on his actual birthday then I think you are being reasonable. Your sister can plan a celebration on his actual birthday if they want, plus he has his party with friends.

Meowmeowgirl · 17/01/2026 20:15

@BendingSpoons i did not quite invite them it was my mom since it was only a small thing not any big stuff. And then it became a big issue for my sister since she didnt say anything or ask to plan anything this time.

OP posts:
Overthebow · 17/01/2026 20:16

Is it on their actual birthday and is he invited? If so, then I think it would be a bit unfair not to celebrate his birthday too. If it’s not on the actual birthday then absolutely it should be just your DDs celebration.

FlapperFlamingo · 17/01/2026 20:16

Of course the kids will want different things so why on earth would they have a combined party? Your mum and sis are actually nuts!! Next year I’d ditch the family party and have a class one, perhaps with a meal out for you and DD.

Bearbookagainandagain · 17/01/2026 20:16

Is it on the actual day? If so then YABU, you can't just ignore that it's his birthday too.

If it's on a different day, then fair enough. Wouldn't be my choice to do that with extended family at that age though. I would have invited a couple of her friends instead.

Overthebow · 17/01/2026 20:16

Meowmeowgirl · 17/01/2026 20:12

@Foodylicious
Their birtdhay is on 21 january and my daughter birtdhay party will be 22 january so not on the aqtually day

Just saw your update. It’s not on his birthday so should just be your DDs celebration.

BendingSpoons · 17/01/2026 20:17

Meowmeowgirl · 17/01/2026 20:15

@BendingSpoons i did not quite invite them it was my mom since it was only a small thing not any big stuff. And then it became a big issue for my sister since she didnt say anything or ask to plan anything this time.

Having read your more recent posts, I agree with you. Your DSis shouldn't muscle in on your DDs party. They can plan their own celebration and let DD have her moment.

Meowmeowgirl · 17/01/2026 20:19

@FlapperFlamingo
yea next year she getting with her class i cant with the drama around family thing😅i told my sister that what if they both get seperate even with faimily? Where they get to choose their own decorations and cakes instead of always being a neutrual color theme

OP posts:
HeddaGarbled · 17/01/2026 20:19

The problem is that this is a family gathering. Ignoring the fact that it’s his birthday as well will seem very pointed.

You can do something completely separate with her that isn’t a class party.

PrizedPickledPopcorn · 17/01/2026 20:20

That’s different then, YANBU. Your sister was being lazy.

Foodylicious · 17/01/2026 20:20

Surely he will have had his own birthday celebration with cake etc the day before at home then?
So she shouldnt expect him to be completely equally included in the celebration.

I do think it will be awkward for family members though who are coming to yours and haven't seen him to wish him happy birthday/give him gifts yet.
Would you not be giving him his gift from you?

Has your sister invited others to hers for his birthday tea?

Meowmeowgirl · 17/01/2026 20:23

i also love taking pics so for her to have in her album my sister said she didnt mind the decoration after «she dosnt have any» but she will make a fornite cake so the kids could blow the cakes togheter she said but it looks weird having a cake like that and then my daughter watching the album and be like wait why was there a fortnite cake on my birthday?🤣

OP posts:
DappledThings · 17/01/2026 20:23

You're both being a bit U and making a mountain out of a molehill by being so inflexible. He could have received his present from you at the same event and been wished happy birthday without that making it a joint party. Similarly your sister could have accepted that much and not tried to force a second cake etc.

Both of you should compromise a bit.

PowerhouseOfTheCell · 17/01/2026 20:24

Your sister is nuts, NO 11 year old boy willingly wants a joint birthday party with a 7 year old girl. Your sister is just picking a fight

Givemeachaitealatte · 17/01/2026 20:24

I think YABU unfortunately unless you were going to go to your sister's afterwards to celebrate your nephew? Family will obviously want to see both children and it makes sense for it to be together. It's also your nephew's birthday so you were expecting your sister and nephew to attend and not celebrate him at all? That would be weird.

Meowmeowgirl · 17/01/2026 20:25

@DappledThings i did told her she could bring his gifts but not a cake

OP posts: