Not sure how many of you have siblings, especially siblings who are damn near the complete opposite of how you are; but regardless of that, siblings are capable of different feelings and such of their parents. The older they are and more capable of making memories or being mature enough to see and understand what's really going on; the younger ones may take reading the farms harder than the older ones. It wouldn't surprise me if the older one may already be lurking here; I'd wager whether it's shower texts or listening to shows or whatever, they probably know about that weird website dad talks about. Nick has five kids, a weird fucking sexual mindset, and at least one kid he choke-slammed; something Nick may or may not consider, is that kids see and talk amongst themselves too. They see or hear mom and dad doing weird shit and for some reason they're confused, scared, or whatever; they go to the next best answer, a bigger kid.
God knows what gets said and done; but Nick better hope the extended family put in effort to keep the kids normal.