They might have been okay in the roles, for the series. However Susan and Robert had such chemistry, particularly in the early years that is difficult to picture anybody other than them, as Mr. and Mrs. Gioberti.
Maggie (as played by Samantha Eggar), Vicki and Chase (as played by Clu Gulager) are in bother, with their vineyard. Maggie and Chase have a bit of a domestic, as their daughter Vicki looks on, (a scene from ‘The Vintage Years’, 1981):
Chase: “Happen we could plough it back into the vineyard and have next years crop shot out from under us, like this one live!”
Maggie: “I could be more helpful, if I knew what was happening.”
Chase: “What do you want me to say, Maggie?”
Maggie: “Are we staying here or are we moving? I need a decision!”
Chase: “Maggie just once in your life will you stop being so practical!”