What happens to my niece and nephews if I stop talking to my sis? WWYD?

[nocontactwithsis]

Hello,
I'm looking for a bit of advice after mulling over this for a few weeks.
I need to be kinda vague as I feel some of the details may be outing.
I live in the UK and I am from North America. My family all live there, but I have my own family here now. I visit every single year.
I have just returned from a visit a few weeks ago and my sister was really pissing me off tbh. She's immature and has no social cues and although we have always been close, she does occasionally rub me up the wrong way. This particular visit I found her to be cold and very standoff-ish.
She has three children, two boys and a little girl, who I am especially fond of and she is of me. I have two kids of my own and my sister never dotes on my DD like the way I dote on her DD if you know what I mean.
Anyways my dilemma is this:
I came home from the visit and then discovered something my sister had done very recently which has betrayed me hugely and I have spent the last few weeks deeply upset and hurt about it. She doesn't know that I know and also hasn't bothered to get in touch since I came back to UK either so I think she possibly has a guilty conscience or she really just doesn't give a fuck.
I really want to cut off contact for a while as I am really hurt and need time to cool off. Also I want to punish her in a sort of way so she sees what she's missing out on, having a great sister like me 🤭
The thing is, what about my niece and nephews? How to you cut your sister off and still have them in my life and see updates on them etc. I don't think she would care if I took my kids from her life, but I would care if I lost contact with her kids as I am just that kind of auntie and family is important to me.

Thanks for reading!

I’m sorry to say this but I do nt think you can have a relationship with a child if you do nt have a relationship with it’s parents.

You don't get to see the kids if you won't deal with their mother.

Agree with the PP, if you want any contact with your DNs you will need to maintain some kind of contact with your DSis.

In my experience it wasn't possible. She poisoned them against me so even though I have done nothing wrong they hate me.

I'm assuming that the kids are young, so you wouldn't be able to have a relationship with them independently of your sister.

Who would facilitate the relationship. You can't visit her home and ignore her, which is where you'd likely see the kids.

If they have mobile phones, then you can contact them directly...without letting anyone know you're cutting her off or reducing contact.