- Brother of Patty Duke. He also has another sister named Karen. Patty is the youngest of all three.
- His parents are Frances and John Duke. Ray portrayed his father in his sister Patty Duke's biopic, Call Me Anna (1990).
- Acting in a film being shot on Vancouver Island, British Columia, Canada called "Adrenaline" (December 2002)
- Ex-brother-in-law of John Astin.
- Uncle of Sean Astin and Mackenzie Astin.
- Granduncle of Ali Astin, Elizabeth Astin and Isabella Astin.
- Acting in a film being shot on Vancouver Island, British Columia, Canada called Adrenaline (2003). (December 2002)
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