Lost in time
In “The Wheeler Dealer,” a third-season “Dallas” episode, Jock (Jim Davis), accompanied by Miss Ellie (Barbara Bel Geddes) and Bobby and Pam (Patrick Duffy, Victoria Principal), visits a Colorado mental hospital to see his first wife Amanda (Lesley Woods), who doesn’t recognize him. When Amanda spots Bobby, she runs toward him with outstretched arms.
AMANDA: There you are! You said you’d come and I didn’t believe you. [She embraces him.] How long was it this time, six months? Do you like my dress? [She twirls.] I bought it special, just for you.
BOBBY: It’s lovely.
AMANDA: I know it’s your favorite color. I wanted to look so nice for you.
BOBBY: You do. You look real pretty.
AMANDA: Are you going away again?
BOBBY: Yes, I have to go away.
AMANDA: [Points to Jock] You’re going with him, aren’t you? He’s a wildcatter. Please don’t go. I wish you wouldn’t. I worry so much about you. Please.
BOBBY: I’ll be all right. You just take care of yourself, OK?
AMANDA: I’m nothing but a burden to you, Jock. And I don’t mean to be. I love you so much. [A nurse approaches and comforts her.] I never meant to be a burden. Never. Really, I didn’t. Never.
As the nurse leads her away, Jock touches her shoulder.
Dallas Decoder 
Lesley Woods playing Pat Duffy’s mom in a soap 25 years later how fun for the 2 of them!
I’m not sure they ever had a scene together, but Patrick’s character was Lesley’s character’s son. (Lesley may have left the show by the time Patrick arrived.)