|Family||Mary Clark (wife), Martha Kent (daughter), Clark Kent (adopted grandson, Jonathan Kent (son-in-law, deceased)|
|Played By||George Coe|
|Last Seen||Redux, 2002|
He expected Martha to become a lawyer and eventually take over his practice. When Jonathan Kent asked him for Martha's hand in marriage, William objected, saying his daughter deserved better than some farmer. Jonathan hit William, and the two didn't speak again for years.
William Clark tried to later reconcile with Martha and Jonathan after they adopted Clark. However, Martha decided that their long-standing history of disagreement prevented them from trusting William with Clark's secret, and Clark was too young to control or conceal his powers, so Martha and William never reconciled. Clark tried to contact his grandfather a few times, but received no answer.
Martha had no contact with her father for 12 years until she went to him for financial help to keep the farm from going under. He came to Smallville and Clark finally met his adoptive grandfather. Clark tried in earnest to get his family to set aside their differences. William provided the financial assistance, but to Clark's disappointment, Jonathan and William did not really reconcile.