No play dates at their house. No unsupervised time together at parties (you’ll still be attending parties for at least another 2 years). Then you can assess the situation and make a decision from there. To be fair, there are not many dads fighting for the opportunity to attend a birthday party. And certainly, this one, who knows that everyone no doubt knows, will be very reluctant to make an appearance.
It’s not just about this man and the risks he poses. It’s also about the risks posed by a mum who minimises abuse happening under her nose. If she did it before (and is still together with him, etc), she is likely to do it again especially if it confirms the comfortable narrative in her head.
I have 2 close female family members married to men who have been convicted of child sexual offences. Neither of them really see the harm in what their partners did. One of them in particular has re-offended with other children since they’ve been married (but not been charged). I know because she told me what he did. She thinks it’s very normal. As long as the children don’t know or he doesn’t actually touch them, there’s no harm in it. But she swears she can control it and he would never do that to my children specifically, so begs to let them come around.
It should be no surprise that we are since NC and neither of them have had any contact with my children since we found out. Partners are groomed too. They easily fall for the ruse because it helps it all make sense to them and allows them to stay in a more comfortable state of denial. Now mum may be fiercely protective and have cut all ties but having her hand forced for contact by the courts and SS. That’s different. If she’s not though, I wouldn’t want my children around someone who is a known supporter of a child abuser.
Of course, there are always the ones you don’t know about, yes, sure. But here’s one where you do, so I’d make decisions accordingly. That doesn’t mean the girls can’t be friends. My dd has friend who has a dysfunctional home life, alcoholic abusive dad who hits her and refuses her food. I will never allow dd to visit her home. But they can still meet up places and the friend can still come to ours.