If the same people have rented the house since 2006, and were living with these alleged paedophiles, surely they knew about their activities.
I think they would have to. Unless they moved out and let the men stay there but didn’t bother changing the lease. I would be very surprised if it turns out that these boys just began doing these horrid activities on their own as such young adults. It seems like such an extreme occurrence and I wouldn’t be surprised if this is something they were raised with, IMO.