SS allows you to collect 80% of your former gross wages in TOTAL benefits. First deduct WC. Then deduct SSDI.

SSDI for a child can be up to 50% of your SSDI benefit. You don't receive more for additional children, the amount is split, and the offset still applies, in fact the children's benefits will be reduced before the applicant.

There is also a COLA to factor. So, every year benefits can go up slightly.

The payment is supposed to go directly into the child's account.

I'm not sure if it's $60 or $300. Hopefully someone else can answer that. Or you can find out at your appointment. You will need to keep records of how the money was spent.