Ranked #5 of 34 in Season 5•+0.6 vs season avg
Mary learns the joys and pains of having a little sister,as she has to baby-sit Trisha on a night when she'd planned to go on a date.
Donna Reed
Donna Stone
Carl Betz
Alex Stone
Shelley Fabares
Mary Stone
Paul Petersen
Jeff Stone
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"Three is a Family" is episode 21 of The Donna Reed Show season 5. It scored 8.1/10 from 24 votes, ranking #5 of 34 episodes this season (season average 7.5). It aired on February 7, 1963.