One of America's most famous families, the Kennedys were for a time considered practically royal. Here are 15 actors who have played John, Jackie and Bobby on screen -- some more believably than others.

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Cliff Robertson plays Lt. John F. Kennedy in a scene from "PT 109." (Nov. 20, 1962)

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In the 1981 film "Jacqueline Bouvier Kennedy," Jaclyn Smith played the former first lady before her marriage.

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Martin Sheen portrayed John F. Kennedy during his presidency in the 1983 television miniseries "Kennedy."

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Brad Davis, center, plays the role of Robert Kennedy, and Veronica Cartwright plays Ethel Kennedy in the 1985 television miniseries "R.F.K. and His Times."

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Steven Weber played John F. Kennedy in the 1990 miniseries "The Kennedys of Massachusetts," which told the story of several Kennedy generations.

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Tthe 1991 television miniseries "A Woman Named Jackie" featured three different actresses as the former first lady. Roma Downey played Jackie during her adult life.

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Sarah Michelle Gellar played teenage Jacqueline Bouvier in the 1991 television miniseries "A Woman Named Jackie." (July 29, 2013)

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In the 1993 television movie "J.F.K.: Reckless Youth," Patrick Dempsey played John F. Kennedy during his younger days up until his congressional nomination. (Oct. 26, 2010)

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Joanne Whalley stars as Jackie and Tim Matheson as John F. Kennedy in the two-part CBS miniseries "Jackie Bouvier Kennedy Onassis," which first aired in 2000.

Credit: FX Network

Linus Roache as Robert Kennedy makes his speech after winning the New York State Senate race in a scene from the FX Network's 2002 TV movie "RFK."

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Katie Holmes portrays Jacqueline Kennedy in a scene from the eight-part movie, "The Kennedys," which first aired in 2011 on cable's ReelzChannel network.

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Jeffrey Donovan portrays Robert F. Kennedy, left, and Leonardo DiCaprio portrays J. Edgar Hoover in a scene from the 2011 film "J Edgar."

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Greg Kinnear portrays John F. Kennedy in a scene from the eight-part movie, "The Kennedys," which first aired in 2011 on the ReelzChannel network.

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From left, Chloe Barach as Caroline Kennedy, Minka Kelly as Jackie Kennedy, and James Marsden as President Kennedy in a scene from the 2013 film "Lee Daniels' The Butler."

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Rob Lowe stars as President John F. Kennedy on the set of National Geographic Channel's "Killing Kennedy," in Richmond, Va. Nat Geo will air the television event in November 2013.

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