I think their mother does understand her child needs help, she may not know how to go about it, or feel that getting him help would be admitting she failed in some way. I see her saying "don't quit on me" as a compliment to you. She respects you, Rayne, and she us terrified of having to deal with him alone.

I think she knows that other nannies wouldn't stay for nearly as long as you have. You developed a connection with these boys and her, and that is why it's so hard for you to leave, I believe. But I also think you quitting might be what it takes for her to get him the help he needs. The last straw, so to speak.

Losing such a caring and competent nanny can be heartbreaking for any family... maybe try telling her that you just cannot put up with his behavior and the risk to your bodily safety anymore. She needs to try to help her son, for herself and for the other boy.

But as much as you care for all three of them, you do need to take care of yourself first and foremost.