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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:
PinkyFlamingo · 24/08/2025 18:57

Why on earth do you want her in your house never mind make her coffee??

Inertia · 24/08/2025 18:58

I hope your sister cleaned up the spilled coffee after behaving like an absolute clown. She’d be getting a plastic beaker of water next time. DH would never get anything made for him ever again.

MaggieBsBoat · 24/08/2025 19:10

very obviously your sister is out of order for acting like that in your home.
But additionally I have to say that giving half a cup all the time would really grind my gears. I wouldn’t say anything the first time but if it were my sister I definitely would be saying something eventually. It’s bloody ridiculous.

samarrange · 24/08/2025 19:21

I would pay to watch DS and DH going into a bar in Italy, ordering a coffee, and getting 25ml in a 75ml cup.

ThatCyanCat · 24/08/2025 19:26

samarrange · 24/08/2025 19:21

I would pay to watch DS and DH going into a bar in Italy, ordering a coffee, and getting 25ml in a 75ml cup.

An espresso is generally 25-30 ml. It's usually served in an espresso cup, though.

Newsenmum · 24/08/2025 19:29

This is incredibly weird. But also, why dont you just fill it up?

Plastictreees · 24/08/2025 19:31

Squirrelsnut · 24/08/2025 18:42

I'm astonished at the amount of replies saying that they also dislike an unfilled cup, as if it excuses the arseholery of your DSis and DH!
Baffling. Do people really care this much about hot drinks?

It’s the definition of first world problems.

Hobnobswantshernameback · 24/08/2025 19:32

Ooh look op never came back

CoffeeCakeAndALattePlease · 24/08/2025 19:33

It all sounds crazy.

MIL says “oh are Fulham playing away” if the cups not full. I mean personally I fill cups up as the vast majority of people don’t spill them. But your sister is rude to keep pointing it out.

whynotwhatknot · 24/08/2025 20:07

XDownwiththissortofthingX · 24/08/2025 16:40

Depends how often you've handed me a half-full cup of coffee despite me reminding you every single time.

I'd give up long before that point and just say no to your offer of half a cup of coffee, but in a hypothetical situation where refusal isn't an option, then yes, eventually I'd lose my temper and you'd likely end up wearing your half cup of coffee.

yeah of course you would

ThreePointOneFourOneFiveNine · 24/08/2025 20:12

Well your sister is incredibly rude, but what I don’t understand is why you keep making her coffee. She’s a family member who visits three times a week, she can pour her own coffee surely? I wouldn’t expect to be treated like a guest in my sister’s house and I don’t visit nearly as often.

CharlotteCChapel · 24/08/2025 20:27

Is she my DH in drag?

Firdbeeder · 24/08/2025 20:36

My husband does this. As he continues to do it despite being told my preference for a simple cup of coffee I have to assume he’s deliberately trying to piss me off so maybe your sister feels the same way. What’s stopping you doing this simple thing for her? You don’t trust her around your carpets?!

IShouldNotCoco · 24/08/2025 20:42

Firdbeeder · 24/08/2025 20:36

My husband does this. As he continues to do it despite being told my preference for a simple cup of coffee I have to assume he’s deliberately trying to piss me off so maybe your sister feels the same way. What’s stopping you doing this simple thing for her? You don’t trust her around your carpets?!

It is bad manners to overfill a coffee cup or a tea cup. I thought most people realised this.

Laura95167 · 24/08/2025 20:45

What odd behaviour. I wouldnt invite her back

VeryStressedMum · 24/08/2025 20:58

Your sister was screaming and lunging at you over a cup of coffee and your husband joined in? They sound like a pair of utter psychotic idiots.

diddl · 24/08/2025 21:48

ThreePointOneFourOneFiveNine · 24/08/2025 20:12

Well your sister is incredibly rude, but what I don’t understand is why you keep making her coffee. She’s a family member who visits three times a week, she can pour her own coffee surely? I wouldn’t expect to be treated like a guest in my sister’s house and I don’t visit nearly as often.

But if sis makes her own coffee she might fill the cup!

TimeFlysWhenYoureHavingRum · 25/08/2025 09:33

Surely it depends how big the cup itself is.

SugarPlumpFairyCakes · 25/08/2025 09:49

Sounds like perhaps you don’t really want your sister around much?

She sounds like a drama queen. And your h too.

Just be too busy to see her from now on.

DilemmaDelilah · 25/08/2025 09:58

I would get an extra large mug (think Sports Direct size) just for her. And then fill it up to an uncomfortable level - not all the way, just too full to be carried comfortably. Then I would make her a HUGE cup of coffee and tell her, very sweetly and nicely, that you have taken her complaints on board and made her a full cup of coffee, but you can't carry it so she will have to pick it up herself. Then watch her struggle.

I used to get annoyed when I went to have a meal at my mother's and she only filled the (small) water glasses half full. I never mentioned it though - I wouldn't be that rude.

Robin67 · 25/08/2025 17:43

XDownwiththissortofthingX · 24/08/2025 16:57

Entitled? No, but as the post you've quoted makes clear, if it happened repeatedly then yes, it would be perfectly understandable for someone to eventually get sick of it and lose their temper.

So then fuck off and stop visiting. You can't turn up at someone's home and assault them with a (half) cup of hot coffee because it wasn't to your taste despite you repeatedly asking. There is no real world scenario where you are forced to accept a drink in someone else's home.

GiveDogBone · 25/08/2025 17:46

This story is almost unbelievable: repeated abuse, crazy dancing.

Now assuming it’s all true, then your sister is batshit crazy. Certainly ban her from the house and suggest she uses the spare time in her diary to go Starbucks.

I mean did it occur to her to ask for a second (in her view, half) cup? Or did she and you refused?

PBJsandwich123 · 25/08/2025 17:56

Smartiepants79 · 24/08/2025 14:30

I read these things on mumsnet sometimes and I just can’t really believe they’re real.
Whose sister actually repeatedly visits and is rude and unkind to them over how they make the coffee? And who allows it to happen more than twice without telling that sister to stop, make their own coffee or leave?
The whole thing is farcical and sounds like you’re both about 7 years old.

I thought this. The way I would handle it is just have coffee at the kitchen table and put the caftiere on the table so she can fill her own cup. The whole situation is mental, but OP's sister does sound rude.

Moii · 25/08/2025 18:00

Let her make her own

NorseHorse123 · 25/08/2025 18:00

She sounds unhinged- I wouldn’t allow her back…. Or if I did, she wouldn’t be getting any coffee!

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