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Season 12 Episode
- Season 6 The First Marriage
- Season 6 Red Tape Romance
- Season 6 Brother Ernie
- Season 6 Robbie and the Chorus Girl
- Season 6 There's a What in the Attic?
- Season 6 Office Mother
- Season 6 Mary-Lou
- Season 6 Monsters and Junk Like That
- Season 6 Charley and The Dancing Lesson
- Season 6 My Son, The Ballerina
- Season 6 The Ernie Report
- Season 6 The Hong Kong Story
- Season 6 Marriage and Stuff
- Season 6 Douglas-A-Go-Go
- Season 6 Charley The Pigeon
- Season 6 What About Harry?
- Season 6 From Maggie, With Love
- Season 6 Robbie and the Slave Girl
- Season 6 Steve and The Huntress
- Season 6 Robbie The College Man
- Season 6 Whatever Happened to Baby Chip?
- Season 6 Robbie and The Little Stranger
- Season 6 Call Her Max
- Season 6 Kid Brother Blues
- Season 6 Robbie's Double Life
- Season 6 Our Boy in Washington
- Season 6 Ernie and That Woman
- Season 6 The State vs. Chip Douglas
- Season 6 A Hunk of Hardware
- Season 6 The Wrong Robbie
- Season 6 The Wheels
- Season 6 London Memories
My Three Sons - Season 6 Episode 7 Mary-Lou
6.50 30 minutes 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 with Robbie Douglas, a genuine college freshman.
