I want to go N/C or do I?

[Rosebel]

There is a bit of a back story to this but I don't think it's relevant. My sister has a DD who's very close to my eldest DD.
A week ago niece told DD her dad (my BIL) had hit her. Its not the first time but it's the first time I'd found out about it straight away.
I wasn't sure what to do so I called Childline who said call the police. It was a really hard thing to do but I did but didn't leave my name.
Obviously police and possibly SS are now involved but BIL is only angry that he was reported, no remorse. He's threatening to beat up who reported him (if he finds out). My sister is living my parents at the moment (under advice) but she doesn't seem to believe he hit her. My parents seem angry too and my dad said he wishes he'd known and he'd have sorted it without the police.
I know (hope) I did the right thing but I want to go N/C. I'm so disappointed with how my family have reacted. No concern for my niece just anger about being reported. I'm also scared of my BIL finding out it was me. I'm very close to my mum who is getting on and I'd hate to cut her out but I am angry with my dad and sister.
If I go N/C who will look out for my niece? What do I do for the best?

Yes you did the right thing and your family's reaction is all the evidence you need. God forbid she told someone and nothing changed like she didn't matter. You don't need to decide anything right now just take one step at a time.

Thanks. It's so hard. I always thought we were a close family and can't believe they are condoning BILs behaviour
It's even worse because my DH is away and I feel vulnerable but every time I think about breaking away I feel like I'd be letting my niece down

How would you describe your family? Is there clear communication, are difficult things spoken about, do people own their mistakes? What was yours and your siblings childhood like? There's a reason your sibling is with someone who is physically aggressive.

We had a great childhood. My dad was at work a lot building his own business but my mum was always there for me, my sister and brothers.
No one including BILs own brother can understand why my sister is with this man. He's always been horrible to my sister but didn't realise how awful he was to my niece.
I'm not as close to my sister as I used to be and obviously not even as close as I thought given she didn't tell me how bad things are.
Communication is good between some family but not others although with my dad he likes to sweep problems under the carpet and pretend everything is fine.
I do love my family but I'm just so angry with them. Possibly my sister knows it was me who reported her husband (as she knows her DD told mine) because she told me not to tell our brothers what happened or she'll never forgive me.

I personally wouldn't go n/c with the whole family but you could certainly cut your BIL from your life and just say you're not comfortable with being around him. Ultimately, your niece might need you at some point so I think it's good to keep the lines of communication open.