Gordon Tennyson

Gordon Tennyson is the middle brother of Vera Tennyson and Max Tennyson and the father of Joel Tennyson.

Unlike Max's side of the family, he, his wife Betty Jean Tennyson and their son are all members of the Plumbers.

History
In Big Fat Alien Wedding, his son Joel marries a Sludgepuppy named Camille, putting an end to a long feud between the Sludgepuppies and the Plumbers. Both Gordon and his wife were against the wedding at first (due to Camille being a Sludgepuppy), but later realize they had treated her unfairly and apologized, accepting her into the family.

Ben 10

 * Big Fat Alien Wedding (first appearance)