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A widower and aeronautical engineer named Steven Douglas raises three sons with the help of his father-in-law, and later the boys' great-uncle. An adopted son, a stepdaughter, wives, and another generation of sons join the loving family in later seasons.
Season 1
36 Episodes • 1960
Season 2
36 Episodes • 1961
Season 3
39 Episodes • 1962
Season 4
37 Episodes • 1963
Season 5
36 Episodes • 1964
Season 6
32 Episodes • 1965
Season 7
32 Episodes • 1966
Season 8
30 Episodes • 1967
Season 9
28 Episodes • 1968
Season 10
26 Episodes • 1969
Season 11
24 Episodes • 1970
Season 12
24 Episodes • 1971
