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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:
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.

HoppingPavlova · 24/08/2025 14:22

What is your definition of right to the top? I would fill it/expect it to be filled to about 1.5cm below the rim of the cup, 2cm at absolute most. Filling it right to the very top so you had to sip it before you could move it would be odd though.

TheMadGardener · 24/08/2025 14:23

I wouldn't be allowing her into my house if she treated me like that. Why are you putting up with this treatment and allowing her back in to repeat it? She needs to apologise.

YetiRosetti · 24/08/2025 14:23

Her behaviour is awful regardless.

as it happens I do still coffee to near the top, about a cm below the rim. Doesn’t excuse her batshit and rude conduct though.

Gowlett · 24/08/2025 14:23

Glad it’s not just me! Solidarity, OP.

DH fills tea up, leaves the teabag in.

Then adds milk… Tea all over the counter.

Then spills it on the floor / coffee table.

I always tip some out when I catch him!

Also fills kettle to the max for one cuppa…

doodleschnoodle · 24/08/2025 14:24

Is she unwell? That’s insane behaviour. The correct response when someone makes you a coffee is ‘Thank you’.

TomatoSandwiches · 24/08/2025 14:25

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

MaryGreenhill · 24/08/2025 14:26

They didn't treat you very nicely @CrashBambiCoot . I would never make another cup of anything for her nor your DH . Let them stew .

Arlanymor · 24/08/2025 14:28

Why did your sister and your husband behave like a pair of goady bullies?

That's appalling.

I wouldn't want to see someone who treated me so awfully - and I certainly wouldn't continue to make her any refreshments.

jonthebatiste · 24/08/2025 14:28

🤦‍♀️

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.

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.

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?

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.

Absentmindedsmile · 24/08/2025 14:33

None of this is normal

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

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.

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…..! 😳

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?

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.

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.

SugarPlumpFairyCakes · 24/08/2025 14:44

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

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