Out of curiosity, what is he asking for ?
Milk for the child ? okay, BUY it YOURSELF, seriously no more money to him.
RENT ?
Can you really afford it ? No, well you shouldn't be using YOUR savings to support him, and you have enough on your plate without having to worry about an ABLE BODIED adult, where is the child's MOTHER in all this ? Is she working or are you forced to support her as well ? Maybe some time in a shelter ( yes I know they can be horrible places, especially for the child ) you raised yours, and unfortunately, they have to raise theirs.
Sometimes we have to take the hardline, and force them to stand on their own, like I stated before you won't be around forever, and then what do they do ?
But no more cash, and only get what the CHILD needs, you might be surprised at how fast things turn around.