I'm recently split up from my ex, we have young kids together aged 1 and 6. After the split, it came to light that ex's sister's boyfriend (we'll call him Gary) has been charged with GBH and is awaiting trial. It's not his first assault offence, this also just recently came to light. Gary is completely amiable in person, really chilled and laid back and quiet but friendly. But he obviously has this other side, which SIL says is because of childhood trauma. He's got kids and has access to them, so has been deemed safe to have the access. He has done some non-violent but unpleasant things to SIL - things like leaving her stranded in a far away town with no money and no means of getting home, and 'accidentally' taking her purse to work with him when he knew she was going out for a night out so she could no longer go. Ex knows all about these things.
So my dilemma is, I don't want my kids to be around him. I don't think he's an immediate danger to them, but I don't really want them developing a family bond with him. To me, family members are people you can trust, people your children know they can turn to if they need to. I don't want someone violent to be that person to my children.
Ex disagrees with me, thinks there's no issue with the kids having a close relationship with Gary, and there's a family get together soon, which ex has invited Gary to. I don't want my kids to go now, and I know my ex has purposely invited Gary before discussing it with me to make me look like the bad person if I object. Up until now, either SIL has attended alone, as while she's not too happy about it, she has respected my wishes.
So, AIBU to feel like this about Gary, or should I let my kids go to family events when he's there? It's not a big event, there'll be about a dozen people there so it's not like a huge room where they won't be near him, but like I say, I don't feel he'll actually harm them, I'm just uncomfortable with the relationship developing.
If I am over-reacting fine, but if I am being reasonable, is there anything I can do? If I refuse to take them, ex will kick off and try to say that I don't have the sole decision over who the kids spend time with. We don't have a custody/access arrangement in place so it's not like we have set days where we're the main parent, in fact I have them a full 7 days and week and ex just visits. Probably not relevant, just preempting any 'who's day is it to have them?' questions.