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.
36 Episodes
1960
36 Episodes
1961
39 Episodes
1962
37 Episodes
1963
36 Episodes
1964
32 Episodes
1965
32 Episodes
1966
30 Episodes
1967
28 Episodes
1968
26 Episodes
1969
24 Episodes
1970
24 Episodes
1971