How Long Do I Need to Work in Order to Qualify for SSDI?
As long as your daughter meets the SSA’s definition of disability, she was disabled before age 22 and her father remains disabled, she will continue to receive 50 percent of her father’s SSDI payments. This is because of a program called Childhood Disabled Beneficiary benefits. When her father dies, she will receive 75 percent of her father’s Social Security check.
If she no longer meets the definition of disability, she will lose the benefit. If her father is not retired and loses eligibility for SSDI, then your daughter will lose eligibility for SSDI.