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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:
TottyMaude · 25/08/2025 21:20

Tell 'em both to get to fuck

Jimmyneutronsforehead · 25/08/2025 21:21

She'd be getting a coffee in a bottle from me for being such a fucking baby.

ManchesterLu · 25/08/2025 21:23

Regardless of anything else, it's so rude to slag off someone's drink they've made you. If it's "half a cup", surely she can drink that, and then have another if she wants more!

She sounds ridiculous. If she's close enough to you to be so impolite, she's close enough to make her OWN coffee when she comes round!

Fluffywabbits · 25/08/2025 21:27

This is the equivalent of a parking thread without a diagram. We can't possibly judge whether you are being unreasonable without seeing how full or not you fill your coffee cups!

Dunnowhatimat · 25/08/2025 21:28

I've a couple of conflicting opinions on this given my situation lol
Of course you don't fill to the brim, it gets spilled and tea/coffee stains everywhere! The person can go out halfway through their cup if they take a while and/or want it fuller and reboil the kettle!
OR they can clean any and all mess they make. Which everyone won't so 'half a cup' (which is actually probably 7/9ths it is!)
Secondly, and here's the conflicting part - is she your younger sister by a few years? I only assume given your DH age but it's a generalisation obviously. If she is, and being a younger sister with my next sibling being 8 years older, yes I make fun of her (as she does me, possibly moreso!) to mess around and get each other's back up (ish). If she's younger she may think it's a 'game' almost. Yes, childish I know. but giving my opinion.

dsndonna · 25/08/2025 21:42

Sorry you were abused by your mother and sister. We were all abused by our violent alcoholic mother, both physically and mentally. To the extent it caused my brother to develop schizophrenia in his late teens, we lost him at a young age. He was never her target but he hated her for what she did to us. My plans for the future were destroyed because we weren't allowed to sleep at night. I had to leave as soon as I could, and have been on my own since I was 16. First few years were so hard. Eventualily I went to uni and now have my dream home, and a very lucrative and successful career. My sister and I always went to see our mother, my older sister didn't and hates her still, even though she's been dead a few years now. Maybe I'm just lucky that I always stayed close to my 2 sisters, we supported each other through our terrible home life, and through being out on our own from a very young age. I'm so sorry you didn't have that with your sister, but OP obviously does have a relationship with her sister, and it could be a good one.

dsndonna · 25/08/2025 21:54

I didn't tell you anything. My response was to OP and had nothing whatsoever to do with you or your situation. I fought with my sister constantly, even as young adults, we had a few scary fights, I had 2 black eyes and burst lips, she had a huge bald patch where I'd pulled out her hair. But we always quickly made up, we loved each other and I knew she had an undiagnosed problem.

k1233 · 25/08/2025 21:56

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.

Totally agree. I drink black coffee - fill it to the top!

Alwaysinamood · 25/08/2025 21:56

maybe spit in the coffee next time or tip it on her head then politely tell her to F off !! Along with your husband- do they usually gang up on you?? Seems like some deep routed hanger issues your sister has!!

Pistachiocake · 25/08/2025 22:02

You could bring in a tray with a coffee pot, mugs and milk, so those people who like it really full can do it that way without the risk of spills (yes, it's annoying to have to keep doing extra cleaning, and could get expensive depending on your flooring).
But after the way this person spoke, I wouldn't feel like bothering. Is she ill? This reminds me of a member of my family who got crazy about coffee not being hot enough (literally steam coming out as it was freshly made), and it turned out she did have a neurological condition. Weird that a coffee situation was the first sign.

Sandinyourshoes · 25/08/2025 22:06

I have a problem with full mugs of tea & coffee. Long ago, before mugs, there were cups & saucers. Now I have a little tray with kitchen roll squares for carrying mugs from kitchen to the living room.

Pinkdhalia · 25/08/2025 22:12

Don't stand for that insulting behaviour from her and definitely not your husband! She isn't welcome tell her! if you do let her in give her bottled water ! She doesn't deserve to be offered a cup of coffee. You need to have strong word with your husband it's rude for him to behave like a child.

JustSawJohnny · 25/08/2025 22:14

This isn't actually about coffee, is it?

What I'd want to know is why she feels the need to needle you, mock you and try to get you to bite.

Is there a deeper issue she's angry about or does she get something out of pissing you off?

naffusername · 25/08/2025 22:20

Why does Hyacinth Bucket to mind?

NoSoapJustUseShowerGel · 25/08/2025 22:24

I’d have stopped making her coffee a long time ago.

BauhausOfEliott · 25/08/2025 22:32

She shouldn’t have wound you up about it, but you do sound really uptight.

Hollybobs1 · 25/08/2025 22:38

She'd be permanently banned from my house after that behaviour. She sounds like a fruit loop.

therealduchess · 25/08/2025 22:38

naffusername · 25/08/2025 22:20

Why does Hyacinth Bucket to mind?

I was thinking along similar lines.
OP, is it possible that your sister & husband have snapped over a building resentment? I have a friend with OCD & her sister won't visit her at home because she once spilt a glass of water and my friend went nuts about it!

DeeKitch · 25/08/2025 22:44

Your floors/furniture, your coffee, your measurements

she can go without

Theunamedcat · 25/08/2025 22:47

Divorce the bullying cunt of a husband he can marry your sister and spill coffee forevermore

If you allow her back in make a pot of coffee (yes that's a thing) put her cup down fill it to the brim and whenever she spills it tell her that's why you give her half a cup because she makes such a fucking mess

blackpear · 25/08/2025 22:59

I hate being given drinks that are less than 1 cm or so from the rim, but your sister's behaviour is absolutely unhinged.

CoffeeLipstickKeys · 25/08/2025 23:08

This really isn’t about the volume of tea in the cup
but you know that already

lotsofpatience · 25/08/2025 23:15

She is a fucking cunt. Sorry you have to put up with her.

DBSFstupid · 25/08/2025 23:19

TomatoSandwiches · 24/08/2025 14:25

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

😂That's so funny @TomatoSandwiches!

Sadworld23 · 25/08/2025 23:25

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.

Glad your life is full of important things like a coffee