I care for my disabled son he is 30 24/7 I am a widow with zero income my son receives social security can I claim him as a dependent

[confusion9-]

He received 1st and 2nd stimulus will he get 3rd

[NCperson]

do you provide more than 50% of his financial support (meaning do you pay for more than 50% of his rent, food, clothing, etc.etc.etc vs. what he pays for).

if yes, you can claim him; if no, you cannot.

but if he has been receiving the stimulus payments, that suggests you have not been claiming him and he is entitled to all three stimulus payments.

You are entitled to them as well. 

[Critter-3]

If you have zero income then claiming him is worthless on your return ... let him continue to get the stimulus payments based off his SS income   and YOU need to file your own 2020 return to get the first 2 stimulus payments as a refund if you did not already get them and get you on the list for the third payment.