Diff'rent Strokes : Mother's Last Visit (1978)
Directed by Herb Kenwith
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Synopsis by Matthew Tobey
Irene Tedrow guest stars as Mr. Drummond's bourgeoisie mother in "Mother's Last Visit." When Mrs. Drummond first meets her sons new street-smart wards, she's less than impressed and doesn't have any qualms about voicing her dissatisfaction; however, Arnold and Willis are able to break through class barriers and help the old woman reconsider her judgments about them.