If they meet Social Security's definition of disability they also must have worked long enough under Social Security to qualify for disability benefits.
Do you know what's the amount needed to get the 4 credits per year?
I don't
Unfortunately, no relevant information is found.
If an adult child is already receiving SSI benefits or disability benefits on his own record how would that affect the possibility of receiving benefits from their parents records?
They should check if they can get benefits payable on their parent's earning record to see if they can get higher benefits and if they are entitled to receive Medicare.
There is something else about benefits planner. What if I want to apply for benefits via the internet?
Do you want to apply for benefits online?
Yes, I want to apply for benefits online.
You can complete your application online.  You will need to agree to terms of service and create a log in.
What happens if you are a spouse or divorced spouse of a retired or disabled worker?