Ranked #19 of 32 in Season 6•−0.1 vs season avg
Chip's secret love is an older girl named Mary Lou. When Steve suggests his love sick son should find out where he stands by asking for a date, Chip calls and identifies himself as 'Douglas'. Mary Lou is delighted -- thinking she is going out
Fred MacMurray
Steve Douglas
Don Grady
Robbie Douglas
Stanley Livingston
Chip Douglas
Barry Livingston
Ernie Thompson
William Demarest
Charley O'Casey
James V. Kern
Director
John McGreevey
Writer
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"Mary-Lou" is episode 7 of My Three Sons season 6. It scored 7.3/10 from 59 votes, ranking #19 of 32 episodes this season (season average 7.4). Directed by James V. Kern and written by John McGreevey, it aired on November 4, 1965.