After the parent dies, the benefit to disabled adult children will be based on the amount the parent paid into the SSA while they were alive and working. You can estimate this amount by looking at your My Social Security account on SSA.gov. Your survivor would be eligible for 75% of the primary insurance amount (PIA) on your account. Your PIA adjusts any year there is a cost-of-living adjustment (COLA) or you have wages, so check back every year.