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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:
Nantescalling · 25/08/2025 18:51

Is there some reason why you can't tell her to do her own?

Bunchymcbunchface · 25/08/2025 18:51

YNBU.
however as a peri menopausal woman I COULD (I don’t) quite easily lose it over something so silly.

Cel77 · 25/08/2025 18:51

She sounds like she needs help. She can make her own coffee if she's ever invited to yours again.

Crinkle77 · 25/08/2025 18:52

TheTeasmaid · 25/08/2025 18:11

@CrashBambiCoot i know the feeling a friend is similar. i always make it about 3 or 5 cm from the lip of the cup to prevent spilling and they act like its holy trinity

3 or 5cm???? Wtf??? I take it they're fully functioning adults who can drink from a cup without spilling it!

Buffs · 25/08/2025 18:52

You know she likes a full cup of coffee so it would have made sense to give her one. Her reaction however was unacceptable.

BestBeforeddmmyy · 25/08/2025 18:53

The whole thing is ridiculous. The issue is not really about how much liquid is in the cup. It’s about appreciating the face that someone is making them a coffee. I would not offer it again. If she wants coffee she can bring her own in a flask.

WorkItUpYourBangle · 25/08/2025 18:57

Tell her to piss off and make her own coffee at her own house. Cheeky bitch.

dcthatsme · 25/08/2025 18:59

Your house your coffee height rules. Really strange and rude behaviour on the part of your sister. She sounds barking! I fill up tea and coffee to the brim to get the most I can, husband does 2/3.

Ladygardenerderby · 25/08/2025 19:04

to the top half way or just an inch in the bottom of the bloody mug she’s a guest in Your home and should just say thank you . Why are you allowing this behaviour towards you and why is your husband siding with her , I’d tell her she either comes and acts like a rational polite human or she doesn’t get through the door again and I’d kick DH arse too

OneKhakiFish · 25/08/2025 19:04

It doesn't matter hiw you do things her behaviour was well out of order and your DH siding with her wouldve got me so angry shed be out the door and hed be getting told in no uncertain terms, treat me with respect or get the fk out if my life. If i dont do drinks exactly to how people like it they do it themselves, its not an issue, theyre both odd

RemusLupinsBiggestGroupie · 25/08/2025 19:08

You both sound ridiculous tbh. If my sister made me half a cup, I’d tell it to put some more bloody water in it, or I’d do it myself.

You sound ridiculously paranoid and your sister sounds like she’s 8,

Hiphopahip · 25/08/2025 19:08

310 replies and not one of them from the OP 🙄

justanotherdrama · 25/08/2025 19:09

I mean I wouldn’t invite your sister round ever again and get rid of “D” h
they both sound absolutely mental!

I decluttered myself of any negative people out my life when I was really sick 5 years ago - anyone that doesn’t have my back is out

best decision I made - you need people you can rely on in life, not people who make fun of you and are negative

Leedssdeel · 25/08/2025 19:13

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?

Your sister sounds a little unhinged ! That’s an extreme reaction!

If I make a normal , instant coffee then I fill it almost to the top but not enough so I have to be really careful not to spill it. If I make a machine coffee , like a Cappucino , then I don’t fill it to the top as it’s too much milk

JayJayj · 25/08/2025 19:13

Her reaction seems crazy BUT I need a photo of said coffee to give my true vote

Keepthecat · 25/08/2025 19:14

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 .

This exactly. I don't think I'd ever make her anything ever again. Just boil the kettle and tell her to help herself, graceless cow that she is. And as for your DH ... never make him tea or coffee again either.

Spinmerightroundbaby · 25/08/2025 19:14

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?

She does sound batshit unless when she is saying half a cup you mean you actually give her one of those tiny little cups you see in some cafes. As you say, most people don’t follow a mug up to the top due to spillage. That said, I always remember growing up and being told ‘has the vicar come to tea again today’ if the vicar’s ‘collar’ was too noticeable!

Awwlookatmybabyspider · 25/08/2025 19:15

She’s 42! If you hadn’t have put her age I’d have thought she was around 12.

Reanimated · 25/08/2025 19:17

Clearly she is crazy. Although short cups of any drink in this house is met with a withering look and the pourer is asked if the tide is out.

CountryMouse22 · 25/08/2025 19:18

Seems to have MH issues. This is not the behaviour of a mature woman.

mrlistersgelfbride · 25/08/2025 19:19

Ridiculous behaviour from them.

Your sister should be grateful you made her a cup of coffee, your husband was foolish to side with her and they both need to grow the fuck up.

Daisythepussycat · 25/08/2025 19:20

Don't ever let her go near Italy - they give you a thimbleful there. Seriously, this is a ludicrous and borderline insane way to behave, and it makes me wonder if she has issues. At best it is rude, ungrateful and bullying; at worst it is completely nuts. And WTAF is your husband playing at, taking her side instead of supporting you? I would be hesitant to invite her again, but if she does turn up give her the tiniest espresso cup you can find, with something disgusting like supermarket own brand instant in it - that'll learn 'er!

lovethenights · 25/08/2025 19:21

I like a full cup of coffee.
When you say half do you mean like half the cup is empty if thats the case you are odd.

Left · 25/08/2025 19:21

This post really needed a photo to show the cup size and fill level of coffee offered. Hope OP comes back to update. Intrigued to see what level of coffee would drive an adult to such unhinged behaviour tbh 😆

OhBuggerandArse · 25/08/2025 19:21

I have a family member who doesn't fill glasses or cups up properly. It is spectacularly annoying and it definitely gives me rage.