All children stay or none at all

[wowmummy]

My mum seems to have this joke that she will have my DS (5) to stay over at her house but not my twin DDs (3)

It is said in a joke way but it's meant if you know what I mean?

Aibu to say they all go and stay over or none at all? I don't want the girls to feel they are being left behind and unwanted 😔

Mine are 10 and 12. My mums never had both together. She said she's done her parenting. Having two who argue and disagree with everything isn't appealing to my mum and I don't blame her.

They've never even had tea at their other nans never mind stop over night.

This. All three together would be a handful, one on one time would be special, however. When the twins are older she'll probably have them to stay, albeit separately.

YABU - They are your kids not hers.
I'll happily look after my friends older child, well behaved
Her younger 2, badly behaved are not my cup of tea and I will look after them singularly now and then as they behave better alone. Together they are a pain in the ass and are so used to not taking no for no that they get a massive shock with me.
I don't mean that they can't play or anything like that, I mean stupid things like I won't allow them to wear their muddy shoes on my carpets, because why the fuck would you?? Or the fact that I don't have the brand of crisp that they want ffs, 4 year old btw! Half hour tantrum, screaming themselves out. I don't budge , they are told calmly no, then sternly no and I don't acknowledge the tantrum.
My children are grown up now so not like I want her to look after mine in return so I get no benefit from looking after them other than to help her out.
Friends "prefers" me to have them over anyone else (including dad that she lives with!) but I'd rather anyone else had them than me 😂

Yabu. GPs take on what they can, better to be honest and say 3 very young kids at once is too much.

Looks like she's favouring your DS because she never had a DS of her own. But I wouldn't be happy with her favouring one child over the other two DC. Just tell her to take turns having one each or don't have them at all.