I am a regular poster but I have gone anonymous for this due to the nature of the content.
I have a long term partner I do not live with. He has a 10yo child who he has 50% of the time, the other 50% of the time the child is with his ex-wife and her new partner, who do live together.
I get on well with the child but as we don't live together, I don't really have any kind of a parenting role. I have no contact with the ex-wife at all.
The child has disclosed to my partner, in front of me, that the ex-wife's new partner recently hit them with an implement.
My partner has further disclosed the child has previously told him that the new partner had hit his ex-wife and has frequently said he is 'angry and shouty'. He tried to have a discussion with the ex-wife about this and offered to help her leave but she shut down the conversation.
The child is, IMO, emotionally immature and quite clingy. (This is one reason we've not moved in together yet.) I've never seen any bruises, clearly I'm not involved in any bathing but my partner says he's never seen any suspicious bruises.
This slap across the head has now been disclosed by the child to a therapist. The therapist is concerned the child is living in an abusive environment at the mum's house. But not concerned enough to make a referral to social care at this stage. My partner doesn't really want to believe this is happening and has his head in the sand.
I am on the fence as to whether this is none of my business and in the hands of a professional already, or a situation where I should be making a referral myself.
YABU - a professional is aware, leave it to them, it's none of your business
YANBU - you should refer to social care