Witnessed my sister batter my niece

[TROUBLEDMAM]

My sister is staying at my house having a holiday as I live in a seaside town and she has eight kids so it's cheaper than a holiday
I've got a five bedroom house so plenty of room for my nieces n nephews.
My sister is always having this crazy on off relationship with her youngest four baby daddy tbf he is a prick. So she's off at the moment n she's stressed
She smokes weed to calm down
This obviously annoys me her children age 13-11 weeks two of which are autistic n have adhd.
So with my three children n her eight granted it's busy n loud n kids fall out
But she is the worst like she screams shouts constantly my head hurts
She doesn't listen to them or interact with them.
Then the 11/12 year old did something which was refused to leave a room once and my sister who had hold of the baby at the time chucked it in his bouncer n literally dragged her from one room to another by her head. Child was crying n she was still screaming n shouting n hitting her
I didn't know where to look or what to do.

She's previously told me her oldest n third oldest girls have been hitting her.
But after a few hours here seeing her parents skills I'm not surprised
They are copying her behaviour n lashing out n also forced to protect themselves

It's unbearable to see n I have no idea what to do
If I said anything she'd flip her lid on me
100%
She's my sister I love her but the kids
She's gonna loose them
N I think she needs too I really do

Help me

TROUBLEDMAM well done, that's an excellent start. Shame you were interrupted.

Is it possible for you to get out maybe? Could you go sit in the park perhaps, away from people and call on your mobile?

Those children need alternative care immediately, it’s not just physical abuse they are suffering from. You need to report the abuse you have witnessed so that ss can come out immediately under section 47 of the children act. Given the number of children here they would go to more than one placement anyway. Ss would turn to family members before foster carers so consider now which ones you could care for. Your doing the right thing, you duty is towards your nieces and nephews not your adult sister. Sorry that doesn’t sound very supportive. Wish you all the best OP its a horrible situation to be in.

The story just seems so full of stereotypes it couldnt be real.

You seem such an entitled, spoilt rich kid that I doubt you are real.

Hi OP. Don't listen to the people on here who are picking on the words you use - they're snobs. But there are lots of people on here who aren't judgey and will give you good advice.
It's not wrong to be afraid of pissing off your sister - she does sound unhinged. But just imagine if you were a kid, not an adult - you'd want someone to stand up for you. You're doing the right thing by asking for help in getting them into a better situation.

The kids need someone.The abuse has not been picked up yet.keep on trying to get the authorities involved.

OP definitely call the nspcc back when you can. You are doing the right thing. I understand how hard and probably stressful it must be for you to do that, but you are thinking of your nieces/nephews.
Ignore the usual MN crap that appears in every feed. There are alot of people on here that genuinely want to support xx
PS. Baby daddy is a term used loads now!