system
A chat on subreddit /r/me_irl
human
The kids are for sure being "put out". I heard a lecture from a psychiatrist that deals with addicted and at risk youth and he mentioned that in his experience,  when a family has over four children, at the very MINIMUM, one is getting neglected.  Then it grows exponentially with every child after (if I remember right it's due to the odds of one needing extra attention).

Not great stats for that situation.
gpt
I wouldn’t know absolute statistics or anything, and of course, for this case it’s all presumption, but at 9, I wouldn’t be surprised if there was at least one with something medical. This would surely play into psychiatric health, as well. But again, it’s all conjecture, unless we know the full situation.