Astin was born Sean Patrick Duke ] in Santa Monica, California. He is the son of actors Patty Duke and John Astin , although his biological father is Michael Tell , a music promoter and writer of Jewish heritage who divorced Patty Duke shortly before her marriage to Astin. At the time of his birth, it was widely assumed that his biological father was Desi Arnaz, Jr . , although this has been stated as incorrect. hollywoodauditions.com:80
Brother of actor Sean Astin. Son of Patty Duke and John Astin. Was accepted to Johns Hopkins University, but did not enroll. Brother-in-law of producer Christine Astin. Uncle of actress Alexandra Astin and Elizabeth Louise Astin. Dominic Monaghan was his www.imdb.com/name/nm0040015/