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AIBU?

Share your dilemmas and get honest opinions from other Mumsnetters.

Sister went nuts over a cup of coffee

509 replies

CrashBambiCoot · 24/08/2025 14:19

my sister visits my house around 3 times a week. Every time she comes she takes the piss out of my coffee calling it “half a cup of coffee” etc

She last visited Friday where I made her a coffee and she snapped “oh come on, fill it up for fucks sake” saying I’d only half filled the mug (I hadn’t).

This morning she turns up. I make coffee, as I was taking it into the living room she looks into the mugs and screams “half a cup of coffee”. I snap back “I don’t fill it to the top so it doesn’t get spilled! Nobody fills coffee right to the top” so she started dancing around me acting crazy shouting “ooo don’t spill it” etc before suddenly lunging at me and shouting in my face - coffee got spilt.

Now I’ve said I’m not making her coffee anymore. That’s it. Sick of the piss taking and ranting and raving. DH witnessed all this and basically joined in with her. She’s 42, DH is 50.

its not normal to fill coffee right to the top is it??? And the hysterics is certainly not normal is it?

OP posts:
spoonbillstretford · 24/08/2025 16:00

PuggyPuggyPuggy · 24/08/2025 15:54

That is literally half a cup of coffee. I'm not exaggerating for comic effect - if you put a ruler in that, the level would be half the height of the cup. Please explain?
Fixed typo

Edited

They are pretty strong so I don't need much in terms of volume. Quality over quantity, any time!

BeltaLodaLife · 24/08/2025 16:01

PuggyPuggyPuggy · 24/08/2025 15:54

That is literally half a cup of coffee. I'm not exaggerating for comic effect - if you put a ruler in that, the level would be half the height of the cup. Please explain?
Fixed typo

Edited

It’s an espresso.

Cherrysoup · 24/08/2025 16:02

NeverDropYourMooncup · 24/08/2025 15:58

Pub's just the other side of the river. They know how to make tea and coffee - we decided it was easier to just drink water afterwards, as she's not going to suddenly get the hang of making tea differently now.

But tipping it out when you’ve made it is really odd. Can you not just tell her you want it stronger? Seems very aggressive of her to sweep in and tip most out.

Poodlelove · 24/08/2025 16:03

What a rude and horrible person.
Don't make her a drink , don't invite her round , what a cow.

XDownwiththissortofthingX · 24/08/2025 16:05

spoonbillstretford · 24/08/2025 15:41

Why not just have second cup?

Because I don't want two underfilled cups, I want one proper cup.

pestowithwalnuts · 24/08/2025 16:05

She doesn't sound quite right in the head..And she sounds like a bully

CherryVanillaPie · 24/08/2025 16:06

Your sister sounds mentally ill

PestoHoliday · 24/08/2025 16:07

I expect this is hyperbole from the OP. 'Screaming in her face' sounds unlikely behaviour from an adult

Op obviously makes ridiculously small coffees. This must be the case or her sister, who has commented repeatedly about wanting a properly full cup, and her own husband wouldn't have been united on this.

CountryQueen · 24/08/2025 16:07

We need a photo. I’ve seen some shit half cups in my time

godmum56 · 24/08/2025 16:09

XDownwiththissortofthingX · 24/08/2025 16:05

Because I don't want two underfilled cups, I want one proper cup.

what would be the difference?

diddl · 24/08/2025 16:09

I'm assuming that before today she had a history of spilling coffee if the cup was full so that's why you don't fill it?

I wouldn't have thought a full cup means to the brim though?

TheBlackSheepbaaaa · 24/08/2025 16:10

Glenthebattleostrich · 24/08/2025 14:22

She wouldn't be back in house if she behaved like that regardless of how much coffee was in a mug. The husband would be out the door too but I don't tolerate arseholery.

This.

Love your username by the way 🙂
"He was a simple ostrich" .

ImGoingUpstairsToTakeOffMyHat · 24/08/2025 16:11

I fill coffee to the top! Largely because I’m not a child

AugustSlippedAwayIntoAMomentInTime · 24/08/2025 16:12

I wouldn't be having her back in my house and I'd be taking a good, hard look at my marriage and whether he's the man you want to spend the rest of your life with.

Plastictreees · 24/08/2025 16:13

People pontificating over the amount of coffee are missing the point. Even if the cup was half filled, it is completely insane to react the way the OP’s sister did. This isn’t about the coffee - I guarantee this dysregulated behaviour occurs in other situations too. She’s out of order and I would be meeting her in public places from now on, where she can pay for her coffee!

XDownwiththissortofthingX · 24/08/2025 16:15

godmum56 · 24/08/2025 16:09

what would be the difference?

A properly full cup is a totally different experience to a half-full cup.

Proper strong coffee is best when it's hot, and you can drink it at a higher temperature if it's filled to the max because when it's only partly full you need to leave it to cool to a lower temperature due to having to take larger sips.

I drink tea and coffee black, so this does make a difference to temperature, and there is no reason whatsoever to leave a black coffee 3/4s full.

Pregnancyquestion · 24/08/2025 16:16

XDownwiththissortofthingX · 24/08/2025 16:05

Because I don't want two underfilled cups, I want one proper cup.

Just relax, all seems a bit OTT about the volume of coffee in your cup, just be grateful that someone made you it. If you can’t do that have water and make coffee when you get home

YourWildAmberSloth · 24/08/2025 16:16

She sounds like an idiot and your husband isn't much better. Why are you allowing this? I would go further than refusing to make her coffee, I wouldn't have her in my home at all. Three times a week is a lot anyway, but she clearly doesn't appreciate you. Doesn't she have family, friends or work to keep her busy?

nomas · 24/08/2025 16:17

XDownwiththissortofthingX · 24/08/2025 14:30

its not normal to fill coffee right to the top is it???

It is in my house, otherwise you'll get told straight.

Nothing worse that looking forward to a cup of coffee and you get handed 3/4s of a cup.

When you’re in someone’s house as a guest, you accept the coffee with grace and say thank you.

Even a child knows this,

And this behaviour is worse than a cup of coffee not filled to the brim.

spoonbillstretford · 24/08/2025 16:18

XDownwiththissortofthingX · 24/08/2025 16:15

A properly full cup is a totally different experience to a half-full cup.

Proper strong coffee is best when it's hot, and you can drink it at a higher temperature if it's filled to the max because when it's only partly full you need to leave it to cool to a lower temperature due to having to take larger sips.

I drink tea and coffee black, so this does make a difference to temperature, and there is no reason whatsoever to leave a black coffee 3/4s full.

At least your cup is half full and not half empty 🙂

whynotwhatknot · 24/08/2025 16:18

i doi do the same as you op but thats not the point-its your house and shes a guest and your dh can fuck off aswell

whynotwhatknot · 24/08/2025 16:18

i doi do the same as you op but thats not the point-its your house and shes a guest and your dh can fuck off aswell

blackheartsgirl · 24/08/2025 16:19

My mum used to make half cups of coffee, it used to drive me nuts. I used to tell her I’d need a ladder to get to the top of that mug, it was a running joke in our house… I’d give anything now for that half cup of coffee lol

anyway op your sister is rude and so is your husband, wouldn’t be making them any drinks going forward!

XDownwiththissortofthingX · 24/08/2025 16:20

nomas · 24/08/2025 16:17

When you’re in someone’s house as a guest, you accept the coffee with grace and say thank you.

Even a child knows this,

And this behaviour is worse than a cup of coffee not filled to the brim.

If you have guests, it's just decent and courtesy to make them a full cup of coffee and not some half-arsed 3/4s full effort.

Fine the first time, you say thankyou and turn a blind eye, then refuse the next time they offer.

To continually give someone an underfilled cup when they've repeatedly explained why they don't like that is just deliberately being disrespectful.

MrsSkylerWhite · 24/08/2025 16:20

TomatoSandwiches · 24/08/2025 14:25

Get her a sippy cup just for your house, silly cow.

This ^

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