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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:
EveningSpread · 25/08/2025 19:21

My mum likes half a mug of everything.

If it was a machine made strong coffee then I’d totally see why it was short.

But in reality, who the actual f complains about a drink they’re given in someone else’s house?

I might say “ohh I like a touch more milk please” if I was being really picky, or remind someone I have sugar if I can’t have it without (I don’t, but people do).

Having a go at you like that is clearly just trying to assert dominance over nothing. I believe people call it “negging”.

Tell her to make her own if she doesn’t like it. Then breezily go out and do something fun next time she complains.

Is your husband always a twat, and has he got form for ganging up on you with your sister? Sounds potentially suspicious to me.

gardenflowergirl · 25/08/2025 19:22

If you go to any coffee shop and order any type of coffee it's always filled to the top. I fill mine to the top at home as well, never spill it.

Cycleaway · 25/08/2025 19:23

How rude. Why does she think it’s okay to come to your house and speak to you like that?! She sounds like a bulshy teenager. Is she okay?!

If you’re nice enough to invite her back after that behaviour, there’s a simple solution, which is not to offer her a cup of coffee again

Zoec1975 · 25/08/2025 19:23

Doesn’t matter where you fill it,she is being a idiot,and I would tell her to make her own or she is not welcome anymore.

Airspice · 25/08/2025 19:24

Well I think it’s bonkers behaviour but I also can’t start half filled up cups of tea/coffee 😄 a cm from the top is max, I like a decent sized cup.

ArtfulDenimSheep · 25/08/2025 19:26

I would be a bit annoyed if someone only presented me with half a cup of coffee/tea but doubt I'd say anything. If you know that your sister reacts in this way why didn't you just fill hers up a bit more, not so any gets spilled but just up to about 1-1.5 cm to the top.

namechangedforvalidreasons · 25/08/2025 19:29

what the fuck did I just read!

Sis sounds like she needs to calm TF down. Don’t know why your DH is joining in. That’s the weirdest part. I’m in the don’t overfill it camp. I don’t like a very full cup of boiling hot liquid, mainly cos I am known to be clumsy, but even if I did, what you’ve described ain’t normal.

Mackerelfillets · 25/08/2025 19:35

I wouldn't fall out with her about it but she would be making her own coffee in future. Your husband though....that's not nice. I'd be having words with him.

mumofsixfluffs · 25/08/2025 19:37

I’m kind of with your sister on this which I why just for myself I have a couple of extra large mugs like this

https://amzn.eu/d/idwsKws

WiddlinDiddlin · 25/08/2025 19:40

The first time, she'd have been told to make it herself.

I'd have serious words with my partner if he took my sisters side when she was being a massive tit (he never would, and she is often a massive tit).

If I'd been so soft as to let it get as far as her yelling in your face and coffee being spilt, she'd never be welcome in my house again!

Hobnobswantshernameback · 25/08/2025 19:41

14 pages of froth and not a sign of the OP

DeeKitch · 25/08/2025 19:47

Sippy cup filled to the absolute brim, lukewarm so she doesn’t burn her toddler mouth

LucyMonth · 25/08/2025 19:50

sniff sniff what’s that I smell? A massive amount of exaggeration to get people on your side?

She was screaming was she? Snapping? Acting crazy? Ranting?

I can’t abide being given a half cup of anything, like I’m a child that can’t be trusted not to spill it.

Do people not joke around and take the piss out of their siblings? & if she says to you repeatedly that you only give her half a cup of coffee why don’t you fill it up properly?

PotatoLove · 25/08/2025 19:51

Both her and your DH need to fuck right off with that ridiculous behaviour.

Millytante · 25/08/2025 19:52

She clearly needs far less caffeine in her life, for a start. Capering about like a demon in front of you! At her age, it sounds like loose screws.
Jaysus, I hope you refuse henceforth to pour either of these ingrates any more coffee.
Your husband needs a kick up the arse too of course. Tell him peace will reign once more only if he buys the house a really snazzy coffee machine he will delight in using himself, so he’ll no longer crib about meagre measures from you.

Buzyizzy217 · 25/08/2025 19:52

Your behaviour was exemplary. The correct way to make a coffee is to leave an inch minimum at the top. You’ve clearly been well taught and I wouldn’t bother making anything for those two oafs ever again.

Batelyboo · 25/08/2025 19:52

LucyMonth · 25/08/2025 19:50

sniff sniff what’s that I smell? A massive amount of exaggeration to get people on your side?

She was screaming was she? Snapping? Acting crazy? Ranting?

I can’t abide being given a half cup of anything, like I’m a child that can’t be trusted not to spill it.

Do people not joke around and take the piss out of their siblings? & if she says to you repeatedly that you only give her half a cup of coffee why don’t you fill it up properly?

Yeah I know due to the nature of Mn we will only ever get one side of the story but I suspect there’s more to this than meets the eye. It’s just not adding up.

Millytante · 25/08/2025 19:54

lovethenights · 25/08/2025 19:21

I like a full cup of coffee.
When you say half do you mean like half the cup is empty if thats the case you are odd.

Maybe it’s the bottom half which is empty, in which case it’s clear the husband is slipping magic mushrooms into everybody’s cups. Hence the capering sister.

GucciBear · 25/08/2025 19:54

It sounds as though she needs mental health check.

Maxorias · 25/08/2025 19:54

Didn't rtft but unless there's a massive drip feed, this sort of behaviour would make me want to bring an overly full cup and make sure to spill half of it on her.

It doesn't even matter if OP really only fills half a cup- so what ? If I'm a guest and someone is making me coffee, the only appropriate reaction is "thank you".

Cinaferna · 25/08/2025 19:58

GreenGodiva · 24/08/2025 14:33

It drives me crazy when people only do cups filled 1/2-2/3. If I wanted a tiny coffee I’d ask for a tiny coffee. If you are making a a drink, you fill the receptacle to about 10- 15mm from the rim ( unless there is a legitimate reason not to. I ask my DH for juice instead of coffee or tea, he brings me half a glass. He’d be bloody gutted if I made him a mini pizza for dinner instead of an actual adult meal but here I am supposed to be happy with half a drink.

I'm the same. I hate underfilled cups. But I'd just top it up without fuss or comment. Her rudeness is the real issue. Not you being stingy with hot water.

PuggyPuggyPuggy · 25/08/2025 20:00

Ooh, this thread has been resurrected!
I think the correct response to being given half a cup of anything is "Oop, tide's out". A cup is a unit of measurement for a drink, same as a pint.

Goldengirl123 · 25/08/2025 20:01

Yes I fill it right to the the top

Missj25 · 25/08/2025 20:01

Absentmindedsmile · 24/08/2025 14:33

None of this is normal

My thoughts exactly !
OP your sister is bonkers & I don’t mean to cause offence..
And what’s that husband of yours story ..
He doesn’t sound too great either being honest ..

HeadsWinTailsLose · 25/08/2025 20:03

She needs to calm down and you need to fill the cup. Personally if one of my family repeatedly gave me short measures I’d offer to make the drink myself.