Sean Patrick Astin was February 25, 1971. He is an American actor, voice actor, director and producer. He is best known for his roles as Samwise Gamgee in The Lord of the Rings trilogy (2001–2003), Mikey Walsh in The Goonies (1985), the title character of Rudy (1993), Doug in 50 First Dates (2004), Jim Kent in the first season of The Strain (2014), and Bob Newby in the second season of Stranger Things (2017). At the time, it was erroneously reported that entertainer Desi Arnaz Jr. was his biological father. When Michael Tell, a writer, music promoter and publisher of the newspaper The Las Vegas Israelite, came to sublet her apartment and offered to marry her as a way out of the scandal, Duke agreed. The marriage lasted only 13 days in 1970, and ended long before Astin was born. On August 5, 1972, Duke married actor John Astin, after having been in a relationship with him for two years. When the wedding guests were invited to speak, 18-month-old Sean looked at John and cried, "Daddy!", to which the Episcopal priest performing the ceremony remarked, "Well, that about does it!" Astin subsequently adopted Sean. In 1973, Duke gave birth to Astin's brother, Mackenzie Astin, who also became an actor. Duke and John Astin divorced in 1985. Duke married Mike Pearce in 1986, and they adopted a son, Kevin, in 1989.

When he was 14, Duke told Astin that Arnaz was his father, and the two developed a relationship. However, in his mid-20s, Astin met a relative of Michael Tell who suggested they were related. Sean set out to find the truth about his biological father, and underwent genetic tests which showed Tell was his biological father. Astin has maintained close relationships with all three, saying, "Desi Arnaz Jr. loves me, and I love him. We are so close...Science tells me...that he's not my biological father. Science tells me that Mike Tell is." Astin considers John his father, as John was the one who raised him. Astin is also close to his stepfather, Mike Pearce, saying, "I can call any of them on the phone any time I want to," says Sean. "John, Desi, Mike or Papa Mike...my four dads."

Astin is of German and Irish ancestry through his mother, and Austrian-Jewish and Polish-Jewish through his biological father.He attended Catholic school and later became a Protestant, attending a Presbyterian church in Bel Air, Los Angeles. Astin attended the Crossroads High School for the Arts and undertook master classes at the Stella Adler Conservatory in Los Angeles. He graduated from UCLA with a B.A. in History and English (American literature and culture). An alumnus of Los Angeles Valley College, Astin served on the school's board of directors of the Patrons Association and the Arts Council. Astin is a vegetarian.

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