((((gentle hugs))))

Of course it's frustrating. No your mom can't be expected to pick up his slack and no you can't jeopardize your own employment.

What about something like getting onto a child care circuit? A day care voucher? It can take months, but putting your name on the list is a step towards relieving you of stress and burden.

Sorry that he's turned out to be such a disappointment. You don't deserve the stress.