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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:
Memyaelf · 30/08/2025 18:55

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?

Easy, next time tell her it’s her time to make the coffee!

IBEAN · 30/08/2025 18:55

Or she made it up.

NewLeg11 · 30/08/2025 18:58

Is this for real???

Dalbs · 30/08/2025 18:59

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?

It’s not about the coffee. It’s something else and she uses this to upset you not very nice sister.

Rcgc · 30/08/2025 19:01

She’s is being unreasonable in her behaviour here. Could be more understanding of your reasons. But to look at this differently if someone said on multiple occasions that there wasn’t enough coffee in their cup. I imagine the first time was a casual comment. I would then just make their coffee with more in the cup! If I went to someone’s house and they knew I liked sugar in my coffee but never put sugar in my coffee. Eventually I would be like come on how many times do I have to tell you how I like my coffee with sugar.

Theunamedcat · 30/08/2025 19:01

NewLeg11 · 30/08/2025 18:58

Is this for real???

Given the lack of update I'm guessing no

HSPme · 30/08/2025 19:11

(1) Tell your sister to make it herself since she always complains when you do it!

(2) Tell her you have run out of coffee!

(3) Don’t be home, go to a coffee shop with a friend instead!

Lots of options. Do not let her abuse you anymore. Good luck.

Milosc · 30/08/2025 19:21

This isn't about coffee. Your sister sounds insane and your DH is a twat going along with it. Tell your sister she is not allowed over anymore and then tell your DH to fix his fucking attitude or he can get out too. Stop letting them abuse you.

Lisa45Red · 30/08/2025 19:35

Wtf is wrong with both of them. If you ever do allow her back into your house she can make her own drinks. It doesn't matter a shit how you make coffee. She's in your house getting free drinks. She's being totally disrespectful. So is he. Why the hell is he on her side? Don't take any crap off either of them.

Rhubarbandgooseburycrumble · 30/08/2025 19:40

Well without seeing where you fill a cup too we can’t comment however, the way she reacted is nuts!

ITryHarder · 30/08/2025 19:44

"Listen Sis, in your home you serve coffee any way you want. In my home, if you want coffee, shut the f up and drink it as I prefer to serve it. If you want more, you know where the pot is." To my husband, "if you can't see the logic in the way I serve coffee or the insanity in the way she just acted, then shut the hell up, and mind your own business."

If this ALWAYS happens with your screwy sister, then YOU'VE allowed it to go too far.

Sharingmythoughts · 30/08/2025 19:46

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?

I’d see her next time with an expresso cup of coffee

Lfcloyal · 30/08/2025 19:48

Just Mellow Birds

StarCurator · 30/08/2025 19:48

Extremely rude and childish behavior; I am sorry, OP. I am a coffee addict, and like to drink very good quality and strong coffee; I usually make it in a Moka pot. I don't expect others to serve me coffee to my exacting standards, however. I usually have plenty before I leave the house in the morning, and will politely sip whatever (and how much) I'm given when I'm visiting others, in meetings, and going to events. It's always nice to be offered coffee, and a social ritual, and to critique blights the encounter. I also have a Nespresso machine and a milk frother, and keep three different strengths of coffee pod in stock to offer to guests.

I also believe that when one visits family members, it's important to be polite and not take relationships for granted. Ditto in marriages; your husband should not have joined in, but should have told your sister to stop behaving so stupidly. I'd stop offering her coffee or any beverages when she comes over, and if she starts deriding you about other matters, I'd ask her to stop visiting.

FENAF · 30/08/2025 19:52

You are, yes, that’s the lamest excuse I’ve ever heard - my husband does the same. Just fill it and if it gets spilled wipe and that’s it, why make such a big fuss out of it, sheesh!

Gonners · 30/08/2025 20:01

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!)

Your tea is frothy with the frothing spittle of rage! I'm with the OP on this, obviously.

NickoDiver · 30/08/2025 20:02

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.

Is she 45 or 4.5?

NickoDiver · 30/08/2025 20:02

Is she 45 or 4.5?

Jesslovesengineering · 30/08/2025 20:07

Sister or not, I'd top that CF up with piss.

ExiledRoyal · 30/08/2025 20:17

First World Problems, aren't they? Families getting blown to pieces in Gaza, and you're squabbling about coffee spills. Get some perspective and try harder to get on.

FlunkyDunkles · 30/08/2025 20:27

Well, there's a bit of a margin between half a measure and a cup being a spill hazard. So if someone is repeatedly suggesting your levels are too low, to them, they probably are. But more to the point if they keep saying it and you don't add more coffee after them saying that, or change how much goes in the cup next time they visit: 1. It's a bit patronising as an adult suggesting they can't manage a normal amount in a cup. 2. They feel un-listened to if each time they flag their unhappiness, they just get the same response. If your not willing to change how you serve someone a beverage after they are unhappy with it, it can seem a little like you're suggesting you know better than them. In terms of the response, the way your sister behaved sounds like someone with ADHD or some neurodivergence. They can feel injustice more acutely and respond with "riskier" behaviour that feels over the top in situ, but it might have been annoying them over time. Of course it might not be. But even if it is, its not how to behave is it? just trying to suggest what could be behind behaviours.

SDTGisAnEvilWolefGenius · 30/08/2025 20:27

You could say that of an awful lot of threads on here, and stuff that people talk about on o5er social media or in real life, @ExiledRoyal.

People carry on having their own problems and woes, and there’s no reason why they can’t discuss them. It doesn’t mean they don’t care about the bigger issues in the world - but no-one can focus on the worst news all the time.

When I see someone saying ‘First world problems’ as you did, I do wonder if they are trying to silence all conversations apart from those deemed sufficiently worthy.

KatyaYusopov · 30/08/2025 21:27

If you have known this would be the reaction why not use a bigger cup that would accommodate more liquid. I hate a small cup too although I think your sister should 1) apologise 2) bring her own mug and 3) buy you some nice coffee.

ThatUniqueTealWriter · 30/08/2025 21:37

OP didn't come back. Weird

Sherrijames138 · 30/08/2025 21:54

I don't think it's abnormal to not fill the coffee cup to the absolute top BUT half a cup is a little stingy. How large is the cup?