No he was not. There was a character named Keith in the
Partridge Family and the second actor who played Christopher was
named Brian Forester, but Brian Keith was not in the Partridge
Family.
Brian Keith was in a show called 'Family Affair.'
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Susan Dey
Laurie Partridge
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The address of the Partridge Public Library is: 23 S Main,
Partridge, 67566 0092