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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:
BruisedNeckMeat · 24/08/2025 15:11

Molehills and mountains come to mind.

Topseyt123 · 24/08/2025 15:12

Your sister and husband are both very rude and I wouldn't be keen on having her round to my house again in a hurry.

In answer to your other question though, yes, it is normal to fill cups and mugs up close to the top. I get annoyed if presented with half a cup of tea or coffee. I like it filled to half to 1 cm below the rim of the cup/mug. I wouldn't be so rude as to say anything to the person hosting me who had made it though. I'd keep it to myself because it really doesn't matter that much as a one-off.

FreezeDriedStrawberries · 24/08/2025 15:12

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.

Yeah but do you dance around yelling and shouting "oooh don't spill it" in their face?!
She sounds deranged.

NeverTalksToStrangers2 · 24/08/2025 15:13

I don't drink coffee but also don't particularly like a cup of tea where there's too little in it. Don't ask me why, but it's wrong.

I think we need the OP to give us an honest photo of her coffee based offerings.

toastofthetown · 24/08/2025 15:13

Surely you’re weighing the coffee beans and water anyway so the brewing ratio is correct? You wouldn’t be able to just fill the cup up after the coffee has brewed because you’d need to grind more coffee Confused

XDownwiththissortofthingX · 24/08/2025 15:14

FreezeDriedStrawberries · 24/08/2025 15:12

Yeah but do you dance around yelling and shouting "oooh don't spill it" in their face?!
She sounds deranged.

Not yet, but if it meant I got a proper cup of coffee the next time I'd give it a go.

AntiBullshit · 24/08/2025 15:14

Almost to the top yes
Half a cup full no

let Her pour the water herself

nomas · 24/08/2025 15:15

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!)

That looks like murky water, not tea or coffee.

MolkosTeenageAngst · 24/08/2025 15:16

In a restaurant a lot of coffees do come filled right to the brim but agree in a home people usually leave a small gap so as not to spill. It depends how much of a gap you’re leaving though. I have a friend who we jokingly say only fills half cups of tea/ coffee; in reality she is probably filling the cup up to between 2/3 and 3/4 but is still leaving far more of a cup than necessary. Assuming you have a steady hand then you only need to leave half a cm to a cm or so, that’s more than enough space for unless you are running with the coffee!

Zippidydoodah · 24/08/2025 15:16

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…

Exactly! I have no idea why people are chiming in in defence of the sil.

myplace · 24/08/2025 15:16

So this sounds like frustration boiling over after years of asking several times a week for a fuller cup.

Obviously she shouldn’t have behaved badly. But why can’t she have a decent size cup of coffee?

DM makes me use ridiculously small cups at her house. I want an actual drink because I’m thirsty, not a ration.

freerangethighs · 24/08/2025 15:17

I would probably have filled the cup about 85% full, but if I'd received a cup of coffee that was less volume than I wanted I might have asked for more up front or, if I was unsatisfied after finishing it, asked for a refill. Given how upset she became, it sounds like your sister was perhaps at the breaking point over something else, and I wouldn't call it "hysterics".

I would worry more about your husband as he performed over something that had absolutely nothing to do with him.

BeltaLodaLife · 24/08/2025 15:17

nomas · 24/08/2025 15:15

That looks like murky water, not tea or coffee.

Edited

Thank you for being the one to say that 😂. I was trying to work out what sort of tea it is because it’s certainly not a cup of “tea.”

Shellyash · 24/08/2025 15:17

Sounds like a storm in a teacup

Knobbsa · 24/08/2025 15:18

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…..! 😳

Last time she would be near my home.
Sister is unhinged and your husband a twat.

Never fill a cup beyond 3/4 way up.
Basic cop on not to over fill.

Text her that you need space.

Fragmentedbrain · 24/08/2025 15:19

She sounds like the kind of person who thinks a big portion is a good portion.

I only really drink espresso so she'd it hate my house.

Noshadelamp · 24/08/2025 15:19

What a ridiculous over reaction in the first place, and then to literally make a song and dance about it is insane.

It is also ridiculous that your DH joined in with her, why didn't he just stay out of it.

I am trying to picture the scene and honestly it's absolutely batshit behaviour from both of them.

Mil fills hers to the top, I fill mine to about a cm from the top depending on the cup or mug.

No song and dance ever ensues.

muggart · 24/08/2025 15:19

Going against the grain here but I think you are pretty odd for repeatedly ignoring her requests for a full cup. Why not just give her the coffee she asked for or at least tell her to make her own? Seems bizarrely stubborn on your part.

Shellyash · 24/08/2025 15:19

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!)

That looks grim

Strawberrryfields · 24/08/2025 15:20

She actually ‘screamed’? Screamed in your face about coffee? Really?

Itiswhysofew · 24/08/2025 15:20

I have a full cup & don't like a tide out cup, but I certainly wouldn't behave as your sister did. Is your relationship like this generally?

DH got a bid carried away, didn't he. Does he act the dick regularly?

Createausername1970 · 24/08/2025 15:21

I am struggling to make sense of this. None of it seems real!

Assuming it did happen, then DH is as bad as your sister.

I wouldn't be inviting her again, and if she has a habit of turning up at about the same time on set days, then I would be out at that time. Let DH make her coffee.

tumblingdowntherabbithole · 24/08/2025 15:22

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!)

That "tea" is a crime.

KarminaBurana · 24/08/2025 15:23

It's not the coffee.
Your sister and husband are bullying you.
Put a stop to it.

BeyondMyWits · 24/08/2025 15:23

In our house we are jokingly petty with each other... passive aggressive humour. (But we all do it.) so she'd have a full cup next time... a cup, not a mug, in fact as smaaaaaall a cup as I could find, full to the brim with hot coffee. "Watch, it's hot", "don't spill it now", "hope it is full enough for you", "I know you like a full cup"... etc.. give as good as you get.

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