Family
- father James F Shannon: Born c. 1929; survived car accident with a crushed leg; raised Shannon and her sister Mary, both fellow survivors
- son Nolan Shannon Chesnut: Born March 15, 2005; father, Fritz Chesnut
- sister Mary Shannon Beatty: Born c. 1963; survived the car crash that killed her mother and sister
- sister Katie Shannon: Died at age three in the same car crash that killed her mother and cousin
- mother Peg Shannon: Born c. 1935; died in a 1969 car crash when Molly was four years old
- daughter Stella Shannon Chesnut: Born Sept. 28, 2003; father, Fritz Chesnut
- cousin Fran Schulte: Died at 25 in the same automobile accident that killed Molly's mother and sister
Companions
- Fritz Chestnut: met at a party she attended while on a blind date in March 2001; engaged as of January 2003
- Jimmy Whalen: no longer together
- Neil Brennan: separated in 1998
