If mother and son have been living together without help of neighbours, boy's father, or grandparents for long, then he'll have done a lot more than you're worrying about every time his mother's been unwell! If you actually want to help, you could offer your number and email address "for if anything crops up and he needs help". For this visit if it's actually ongoing, and for any future trips that might eventualise. At the very least you could prevent him undergoing the ministrations of social services, should anyone decide to "dob them in".
I wish them both the very best, and I hope everyone on Gransnet does too.