Jonathan and Martha Kent

Jonathan and Martha Kent are fictional Superman characters who were the adopted parents when they found the baby Superman in the field. They cared for "Clark Kent" until he became an adult. The Kents died from a rare tropical disease with Martha dying first. Before he died, Jonathan told the Clark should use his powers for good in earth. In other cases, Jonathan dies and Martha is still alive.
Glenn Ford and Phyllis Thaxter play Jonathan and Martha in "Superman" and by Kevin Costner and Diane Lane in "Man of Steel".