Your right, it was terrible. **They were totally left to their own defenses and we have kids in the family that are nonverbal/autistic! **
My sister-in-law is restricting her children from contact with my sister, it seemed extreme, but now I wonder if that is the best thing to do. Maybe force her to choose between him and us, it seems wrong but I don’t know what else to do.
That is absolutely horrifying, especially since she knew about that aspect ahead of time.
As others have mentioned: this isn’t extreme. I don’t know how many kids you have, but I can tell you that as the mom of exactly one, it will be very difficult to keep an eye on one every minute of a family gathering, and impossible with more than that. This is for their safety.
It’s very sad, but she simply isn’t trustworthy anymore. Has anyone talked to her about this guy and his prior convictions, and the reasons that you don’t want him around kids? What has she said?
A bit of perspective: in my own family, a couple of close relatives were molested by a pedophile who was ostensibly paying attention to mom, but was using her to get at the kids. The extra veneer on this whole thing was that the kids were brought up in an extreme Catholic household: sex was never discussed, your body and references to it were dirty and bad, and so forth. (Of course, this isn’t Catholic teaching, but it’s how the kids were brought up.) As a result, the kids never went to mom about being molested, even though it happened for years, because they figured that if they did, they’d be punished for even mentioning certain areas of the body, much less “Mr. Smith did X and I didn’t like it and it scared me.” Plus, of course, Mr. Smith was a close friend of mom, so who was she going to believe? And even if dad might have listened, it was ingrained in the girls so strongly to never bring up body parts with anyone but especially men that they wouldn’t have told.
Of course, it’s probably not like that at your and your relatives’ houses, but I wanted to give you a heads-up. He has had access to the kids now. It’s unlikely at best that he did anything on the first contact (pedophiles are generally not that stupid: he’d have wanted to gauge the family dynamics first), but keep an eye on the kids for changes in behavior and attitude, and please, please make sure lines of communication are open. Depending on the ages of the kids, it might be time to have a pretty blunt conversation with some of them, too. In particular, if any kids are particularly vulnerable right now (parents going through a divorce? Ill sibling taking up a lot of attention?), look out for them. Pedophiles
love to find kids who need a “special friend” because their world seems upside-down.