Question: who played fred macmurray's wife on my three sons
Answer: The following year in the tenth season , 1969 - 1970 , Steve remarries , taking widowed teacher Barbara Harper ( Beverly Garland ) as his wife ; she brings with her a 5 - year - old daughter , Dorothy `` Dodie '' ( Dawn Lyn ) , so Steven now had a stepdaughter whom he also subsequently adopts .