- His father, Jack Lemmon, worked with him in his initial movie credit, Airport '77 (1977), where he played a radio operator.
- Son of Jack Lemmon
- His mother is former actress Cynthia Stone, who went on to marry Cliff Robertson in 1957 after divorcing Jack the year before.
- His half-sister, Courtney Lemmon, runs a charitable foundation endowed by her father. She married Joel McCrea's son, Peter McCrea.
- Wrote a memoir about life with his father in a book entitled, "A Twist of Lemmon: A Tribute to My Father", his first book.
- Lives in Connecticut with his wife, Gina Raymond, and their three children: daughter, Sydney Lemmon (Sydney Noel Lemmon) (born in 1990), and two sons, Christopher Lemmon, Jr. and Jon Lemmon (Jonathan Lemmon) (born in 1994).
- Stepson of Felicia Farr.
- Older half-brother of Stephanie Robertson.
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