A Ford dealership will buy a car, but depending on the value versus what's owed, your family member may have to pay the difference to the finance company, and when selling the car, that amount becomes due immediately. Ford will not finance a personal vehicle from another family member, the first would have to go to a bank or credit union. And lastly, nobody will finance them if they have no job unless there's a co-signer, and even then, some banks and CU may not let them be on the loan when they find out they're unemployed.
