I don't have the complete answer but if he is on SSI (Supplemental income, usually people that haven't worked or paid enough in to be covered by SSDI) then no. If he is on SSDI (Disability), I know that children that live with the parent getting the SSDI get benefits. These benefits are called axillary payments. The amount of them is 1/2 of what he gets and it wound be divided among the children. So if he got $1000 then the kids would get $500 to be split between all kids. Since they don't live with him, I don't know if they are entitled or not. She can call the 1-800-772-1213 (Social Security) and talk to them about it. If they are entitled to it, she will get back benefits for them. She can always schedule an appointment with her SS office but if they aren't married, they won't be able to give her any information. She needs to look into getting a lawyer that specializes in social security disability--the consultations are always free and that would answer her question.