How he met their mother
In “Dallas’s” fifth-season episode “Showdown at San Angelo,” Clayton (Howard Keel) approaches Miss Ellie (Barbara Bel Geddes), who is playing with John Ross (Tyler Banks) outside the Southern Cross ranch house.
CLAYTON: Mrs. Ewing? Clayton Farlow. [They shake hands.] Not the best of circumstances to meet under.
ELLIE: That’s unfortunately true.
CLAYTON: I can understand how you and Mr. Ewing miss the boy. Since he’s been here, he’s brought a lot of joy to me.
ELLIE: My husband feels he belongs at Southfork. He’s a Ewing.
CLAYTON: [Chuckles] That he is. But what my son wants is just as important to me as what J.R. wants is to you. And he wants Sue Ellen and John Ross here. The boy belongs with his mother.
ELLIE: My husband usually gets what he wants.
CLAYTON: He’s not in Ewing country now. And what happens is between Steven and J.R. It’s not our fight.
Dallas Decoder 
I adored how the relationship between Miss Ellie and Clayton grew from friendship into a real solid love story. So glad they kept him on as a character.
Me too! Clayton is a great addition to the show. Thanks Lady G.!