Did John Wayne sons play Cahill US marshell?

No, John Wayne's sons did not play the role of US Marshal "J.D." Cahill in the TV series "The Marshal" (also known as "Cahill U.S. Marshal").

The role of J.D. Cahill was played by William Smith.

John Wayne had four sons:

* Patrick Wayne

* Michael Wayne

* Ethan Wayne

* John Wayne (Jr.)

While his sons did appear in some of his films and other projects, none of them played the role of J.D. Cahill in "The Marshal."