Please or to access all these features

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:
geoger · 24/08/2025 14:57

This is nuts!
I fill coffee and tea cups 0.5cm to 1cm from the top. I like a full cup and proper sized mug
Also, when I go to my sisters house or she comes to me we make our own (and each others) teas and coffees and have our mugs at each others houses. DH has certain way of having his coffee and always asks to make his own.
Next time - tho I’m not sure I would be inviting her over any time soon - let her make her own.

tomaskmckmac · 24/08/2025 14:56

it really does sound like she drinks waaaay too much coffee tbh. I'd advise decaf from now on

KTheGrey · 24/08/2025 14:54

Astrabees · 24/08/2025 14:51

Of course she is being unreasonable but it is one of my bugbears that I just hate it when I get half a cup of coffee. It is usually when someone uses a cafetiere and tries to make it go round too many people, FFS make another one quickly or make one earlier and put it in a flask, don't piss me off with half measures.

Crumbs it’s hard to offer some people hospitality. I was brought up with ‘when in Rome’.

EmotionallyWeird · 24/08/2025 14:54

I don't like it when my mug isn't full enough, but I don't take the piss out of the person who made it, either ask for more water or just suck it up. It's very immature to make such a fuss about it and I would not be enabling it any more. If she wants coffee she can make her own.

Trovindia · 24/08/2025 14:53

Her behaviour was poor but I think she was trying to be joking with you.

Yabu for not filling the mug, my mum she's this and I have to go and top it up. I fill mugs to about 1.5-2cm below the rim, like this (I don't know why my tea is frothy!)

Sister went nuts over a cup of coffee
KTheGrey · 24/08/2025 14:53

The coffee is neither here nor there. Nobody should come into your house and shout at you or mock you. If she doesn’t like the way you pour coffee she can a) not have any coffee b) bring her own coffee c) go to a coffee shop or d) ask you nicely for more coffee when she has finished the first one.

She and your husband sound quite odd and rude.

Astrabees · 24/08/2025 14:51

Of course she is being unreasonable but it is one of my bugbears that I just hate it when I get half a cup of coffee. It is usually when someone uses a cafetiere and tries to make it go round too many people, FFS make another one quickly or make one earlier and put it in a flask, don't piss me off with half measures.

LadyQuackBeth · 24/08/2025 14:47

It's the kind of stupid fall out that happens in families, normal probably lies halfway between how empty you're leaving it and how full she wants it.

Maybe get some bigger mugs/cups so you can give people more coffee without worrying about them being over full.

WhereIsMyJumper · 24/08/2025 14:45

I don’t think it makes a blind bit of difference if you’re right about not filling the coffee to the top or not. What does matter is your sister treating you like shit in your own house after you’ve just made her a drink and your DH joining in…

SugarPlumpFairyCakes · 24/08/2025 14:44

What a pair of freaks your h and your sister are.

Lavenderandbrown · 24/08/2025 14:43

I mean what difference does it make? Can she have a second cup if she finishes the “half cup” you give her? It’s bullshit op and stop tolerating it. And she’s spilled now so she stays in the kitchen with her scarcity coffee rations at the table or a counter.
and if you can’t afford to give her a second cup then she drinks enjoys and appreciates the 3/4 cup you do make for her out of your current tight food budget.
oh and tell DH no siding with her ludicrous behavior as you in fact are his wife and her hostess.
I speak from experience op I had this with my brother who is my elder by 7 yrs. Forbidding me to run the Hoover in my own home and yelling at me on two occasions in front of my dc and other family. I shot him and his bullshit right down I will not be disrespected in my own home that I paid for by someone eating the food I paid for and prepared while luxuriating in the lovely holiday atmosphere I spent weeks creating. And hosting/ gifting his dc (who is a wonderful appreciative guest). And guess what….he stopped.

amillionandone · 24/08/2025 14:41

What in the... They're acting nuts, or to be kind, like immature children. If you've made enough for them to refill their mugs and drink their fill, why does it matter if the mug isn't full? I assume you offer/allow refills.

If someone behaved that way in my home, I think I'd stop having them over and tell them why. At least until they promised to grow up or get the psychological help they apparently need.

Yellowbirdcage · 24/08/2025 14:41

She’s odd. And so are some of the people in this thread! If you need more coffee I’m sure your host will make another one. What do you do if the cup is smaller than you feel you need? Why not just ask for a bigger mug?

Zippidydoodah · 24/08/2025 14:37

Fucking hell! That would be the last time she came to my house, let alone had me make her a cup of coffee! And as for your husband…..! 😳

DarkYearForMySoul · 24/08/2025 14:34

They both need a (lukewarm) cup of coffee in their laps … or maybe just make their own from now on.

YanTanTetheraPetheraBumfitt · 24/08/2025 14:34

She was rude and no her behaviour isn’t normal.

saying that dh fills a mug up two thirds and it does annoy me 🤣

BlaBlaBlaBlaBlaBlaBlaBlaBlaBla · 24/08/2025 14:34

I like mine about 5 mm below the rim, can’t stand a part filled cup but would just politely ask for it to be filled to the top.

was your sister being rude or just silly? Either way you’re both adults and should be able to speak to each other like grown ups

Absentmindedsmile · 24/08/2025 14:33

None of this is normal

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.

FancyBiscuitsLevel · 24/08/2025 14:32

gosh how rude of your sister.

It doesn’t matter how she fills up coffee- she is a guest in your home and was acting with no manners.

forget not making her coffee, tell her at the doorstep she’s not welcome until you’ve had a real apology and she’s remembered how to be a guest.

does she ever host or are you just expected to wait on her?

Endofyear · 24/08/2025 14:32

I would just tell her not to come round any more. She sounds like a pain in the arse.

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.

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.

AintNoPunshineWhenShesGone · 24/08/2025 14:30

It's not normal to fill it to the top, no.

But nor is it normal to leave it so short your sister and DH think you're giving them too little.

jonthebatiste · 24/08/2025 14:28

🤦‍♀️