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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:
MushroomQueen · 25/08/2025 20:06

Can I see an example coffee? She’s being a bitch regardless tho

Greenwriter76 · 25/08/2025 20:08

What in the they-both-need-sectioning is going on here?

I love coffee - but if I go to someone’s house and they make me one, I accept however much I’m given gracefully. End of.

400rider · 25/08/2025 20:09

And this is when I’m glad I don’t have a sister. She still calls three times a week? When do you go around hers?

If she likes drinking coffee that much (it’s getting expensive) tell her to bring her own in future to make (my DIL sister has her own jar in the cupboard because her baby sister and my son drink tea)

Onthemaintrunkline · 25/08/2025 20:11

So yr sister comes to your place for a ‘disappointingly short fill’ cup of coffee 3 times a week. If she’s so upset about what she perceives as short rations, why has she continued to come and has she ever, instead, invited you to have coffee at her place?

dsndonna · 25/08/2025 20:15

I used to fall out with my sister all the time, she was very volatile but I knew she couldn't help it, she had been started on valium age 12 when puberty started and my mother couldn't cope with her. She was never actually diagnosed with anything back then, but I think it was ADHD. When she was a teenager she was always in scraps, all the boys same age were terrified of her. I was a couple years younger and she protected me like a tigress. So she was volatile and over the years I'd had plates and cups launched at me many times. And exactly for the type of situation you're talking about. What's the problem with filling up her coffee? She told you more than once it was bothering her. Don't fall out with your sister, cherish every day you have together. I lost my sister and all the fun has gone out of my life, she was the funniest person I knew. So just fill up the coffee cup and enjoy every minute you have together ❤️

CallieOMally · 25/08/2025 20:18

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!)

Sorry but what the fuck is this abomination??

Devora13 · 25/08/2025 20:18

Has she got a life?

Delphiniumandlupins · 25/08/2025 20:20

We probably need a picture to show how full you fill your mugs.

However, your sister is being rude. Anyone who comes to my house 3 times a week can make their own coffee if they don't like how I do it. Do you ever go to her house? Does she fill mugs noticeably fuller than you?

Thisisbetweenyoumeandtheinternet · 25/08/2025 20:25

Can we see a pic of it? Like how high you fill it?

If you know she does it just fill it right up?!

DeeKitch · 25/08/2025 20:28

If she enjoys your ‘short’ coffees so much she can have a second one, it’s not as if she can only have one cup is it?

DeeKitch · 25/08/2025 20:28

dsndonna · 25/08/2025 20:15

I used to fall out with my sister all the time, she was very volatile but I knew she couldn't help it, she had been started on valium age 12 when puberty started and my mother couldn't cope with her. She was never actually diagnosed with anything back then, but I think it was ADHD. When she was a teenager she was always in scraps, all the boys same age were terrified of her. I was a couple years younger and she protected me like a tigress. So she was volatile and over the years I'd had plates and cups launched at me many times. And exactly for the type of situation you're talking about. What's the problem with filling up her coffee? She told you more than once it was bothering her. Don't fall out with your sister, cherish every day you have together. I lost my sister and all the fun has gone out of my life, she was the funniest person I knew. So just fill up the coffee cup and enjoy every minute you have together ❤️

Sorry for your loss ❤️

SooPee · 25/08/2025 20:31

Bless you, as someone above said, her correct response to you making her a coffee should be thank you! This isn't about the coffee, your Sister sounds nuts and knows she can treat you like that, getting up in your face screaming at you would be the final straw for me personally, if it wasnt the coffee she'd choose something else as an excuse for her behaviour towards you. I have a shouty belittling brother like this and no longer see him, thankfully he lives miles away now, I email if i absolutely have to speak to him.

If you actually want to see her again (I wouldn't and you're allowed to say no or suddenly have a freind to see that day each week from now on or something), I'd suggest going out for coffee instead.

I'd also stop making the DH drinks, if he doesnt like the way you make it why doesn't he make it himself?
Your sister is nuts and your DH is encouraging her behaviour, sorry you are dealing with it

DelilahMy · 25/08/2025 20:34

There’s a wonderful old saying for this scenario: ‘‘Is the tide out?’

Sennelier1 · 25/08/2025 20:36

Mugs can be very large and coffee tends to become cold quickly, no? I fill them half and tell my guests I will top up with hot coffee whenever they want more 🤷🏼‍♀️ Indeed it's not good manners at all to fill a mug to the top.

Sennelier1 · 25/08/2025 20:36

Mugs can be very large and coffee tends to become cold quickly, no? I fill them half and tell my guests I will top up with hot coffee whenever they want more 🤷🏼‍♀️ Indeed it's not good manners at all to fill a mug to the top.

SooPee · 25/08/2025 20:40

Oh and if she's coming 3 times a week why can't she make the coffee, I don't understand why someone would cause an argument over something she could easily solve herself. If I'm at a friend or family house and I want the drink made the way I like it I just offer to put the kettle on and make the drinks, "you put your feet up Sandra, I'll make these" type thing.

localnotail · 25/08/2025 20:46

She sounds unhinged. Did she forget to take her medication?

LakotaWolf · 25/08/2025 21:04

dsndonna · 25/08/2025 20:15

I used to fall out with my sister all the time, she was very volatile but I knew she couldn't help it, she had been started on valium age 12 when puberty started and my mother couldn't cope with her. She was never actually diagnosed with anything back then, but I think it was ADHD. When she was a teenager she was always in scraps, all the boys same age were terrified of her. I was a couple years younger and she protected me like a tigress. So she was volatile and over the years I'd had plates and cups launched at me many times. And exactly for the type of situation you're talking about. What's the problem with filling up her coffee? She told you more than once it was bothering her. Don't fall out with your sister, cherish every day you have together. I lost my sister and all the fun has gone out of my life, she was the funniest person I knew. So just fill up the coffee cup and enjoy every minute you have together ❤️

I’m glad to hear you eventually got along with your sister, but bollocks to the blanket sentiment of “don’t fall out with your sister” and “cherish every moment you have with your sister”. Not everyone has a great relationship with their sisters. Mine joined my mother in physically abusing me when I was a child. To this day, my sister abuses me verbally, emotionally, and mentally (I’m too large to abuse physically or I’m sure she’d still be doing that, too.)

Not every sister is to be automatically treasured simply because they’re your sister.

Mine is similar to OP’s in behavior and I avoid interacting with her as much as possible. It’s infuriating when someone tells me I ought to love and treasure her just because she’s my sister, when I know she’s the second-biggest abuser in my life right after my mother.

Were I OP, I’d be filling my sister’s mug right to the brim the next time she visited and when the scalding-hot coffee slipped out and burned her, I’d say, “isn’t a full cup of coffee what you WANTED?”

TimingOff · 25/08/2025 21:06

It's not about the quantity of coffee, it's about being treated as a child when you're in your 40s (or 50s, as I'll wager the DH feels it too). If the sister has mentioned it lots of times and the OP just keeps insisting she can't be trusted with a full cup of coffee it would be maddening.

I suppose some people are always polite with their family but surely if you are close it is not about 'host' and 'guest' but about your relationship? i.e. it's not about the coffee, OP!

Edamcheese · 25/08/2025 21:09

I get it that you don’t want to spill the coffee so why not buy larger mugs then she can enjoy a bigger drink. I like a nice amount of coffee and use large mugs. But she isn’t paying for it so she has a cheek to make you feel bad ,she should just ask you politely to fill it up a bit more while you are making it. And tell your dh to do one . I get this myself in cafes, I ask and pay for extra large coffee and it’s only just over half full with the rest froth I always go back and ask them to fill it up politely which they do.

Rewis · 25/08/2025 21:12

She sounds like a bit of a bitch. But she's your sister who comes over often, so she can make her own coffee and fill it up as much as she wants.

Thehappygardener · 25/08/2025 21:13

I go to a lovely friend once or twice a month and her husband makes the coffee in a very expensive coffee machine. But the cup is always only half full and always lukewarm!

I’ve yet to say anything, of course, but have thought of sneaking some hot water in a thermos flask when I visit!

And yes, your sister is being ludicrous, but presumably something else is really worrying or annoying her?

Hope it all resolves 💕

Jk987 · 25/08/2025 21:14

I would have got her to make her own a long time ago.

winter8090 · 25/08/2025 21:14

She is being unreasonable.
Tell her to Drink her bloody coffee and if she wants another one help herself. Or even better tell her to
make her own coffee.
Don’t tolerate her belittling you any more.

Millytante · 25/08/2025 21:16

localnotail · 25/08/2025 20:46

She sounds unhinged. Did she forget to take her medication?

“Mmmm! Damn fine Largactyl!” ☕️

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