My partner has two boys (5&6). They often come to our with bruises and scrapes, but this time I asked what had happened and the eldest said “[stepdad] hit me”. On probing a little he also said that they often get hit “when we’re doing bad things” and that mum hits them too.
What should we do? I don’t have a relationship with their mum at all and she has previous with abuse and assaulting my partner with their children present. I feel completely out of my depth - if something really awful is happening I feel I can’t ignore it, but also don’t want to start a war...