Family
- father Wally George: separated from DeMornay's mother when she was two
- mother : separated from DeMornay's father when she was two; married second husband named DeMornay soon after divorce; died c. 1985
- step-father : took his surname; died when DeMornay was five
- brother : born c. 1964
- daughter Sophia Demornay-O'Neal: born on November 16, 1997; father, Patrick O'Neal
- daughter Veronica DeMornay-O'Neal: born on March 31, 2001; father, Patrick O'Neal
Companions
- Harry Dean Stanton: had brief romance
- Leonard Cohen: no longer together
- Patrick O'Neal: born on September 14, 1967; son of actors Ryan O'Neal and Leigh Taylor-Young; together since c. 1994
- Tom Cruise: co-starred together in "Risky Business" (1983); lived together for 2 and a half years
