Family
- grandfather Simon Elwes: born on June 29, 1902; died on August 6, 1975
- mother Tessa Elwes: born on December 7, 1938; has a twin sister, Marina; eloped with Dominic Elwes in Havana, Cuba in January 1958; remarried in a civil ceremony in NYC after her father attempted to stop their marriage; divorced
- father Dominic Elwes: lived in Spain; born on August 17, 1938; died in September 1975
- step-father Elliott Kastner:
- brother Cassian Elwes: born on August 7, 1959; named vice president of William Morris Agency's independent film department
- brother Damian Elwes: born on August 10, 1960; formerly married to Christina Oxenberg
- half-sister Milica Kastner: born c. 1971
- half-brother Dillon Kastner:
- daughter Dominique Elwes: born April 24, 2007; mother, Lisa Marie
Companions
- Lisa-Marie Kurbikoff: born c. 1971; met in 1991 became engaged on December 12, 1997
