'The Lord of the Rings' star Sean Astin loves his big, blended family. Here’s everything to know about Sean Astin’s mother Patty Duke, his father John Astin and his biological father Michael Tell.

The outcome: Michael Tell was Sean's father. "If you want to know who I am, John Astin is my father, Michael Tell is my biological father," Sean told PEOPLE in 2001.

Oscar winner Patty Duke died this week at the age of 69.With renewed interest in her career as well as her personal life, interest resurfaced in the unusual story about how her son, Sean Astin ...

As the son of Patty Duke, Sean Astin came from a famous family, but his background is more complicated than you might think. ... That’s when she met Michael Tell, ...

Sean Astin has announced his intention to run for president of SAG-AFTRA, the country’s largest acting union. Astin’s ...

Duke died of sepsis from a ruptured intestine, leaving behind her last husband, Michael Pearce, and three sons: Kevin, Sean Astin and Mackenzie Astin, as well as many, many fans.

"If you want to know who I am, John Astin is my father, Michael Tell is my biological father,” Sean told PEOPLE in 2001. He’s close to all three men and considers them all family — Sean also ...

When Patty Duke gave birth to her first son, Sean Astin, in 1971, her life was plagued by tabloid headlines. Duke had colorful romantic history: Having just come out of a scandalous relationship with ...

'The Lord of the Rings' star Sean Astin loves his big, blended family David S. Holloway/Getty ; Jim Smeal/Ron Galella Collection/Getty Left: Patty Duke attends the Creative Coalition's 2004 Capitol ...