Family
- grandfather John Carradine:
- father Keith Carradine: Met Plimpton's mother when he appeared in "Hair"; did not meet daughter until she was four years old
- mother Shelley Plimpton: Met Keith Carradine while appearing in "Hair"; later married and divorced director Daniel Sullivan
- step-father Daniel Sullivan: Divorced from Plimpton's mother
Companions
- John Walker:
- River Phoenix: deceased
