Parents requests child to get more food.

[Rachael]

$400 a month = $4800 a year = $92.31 a week = $18.46 a day.

You mentioned him being there for breakfast so I'm guessing he's there for around 7am. And you said he gets picked up at 5.30pm, that is a 10.5 hr day without considering time you spend cleaning and prepping. So this Mom is paying you $1.75 a hour. And from that $1.75 an hour, you a providing all his food. You honestly are working for free with this client.

I think you've been beyond generous in sticking to the agreement for what has likely been some time.

Since you are working for free, if this parent terms, you aren't any worse off. I think you should consider that when you decide what to do.