When Huston was four, her mother died in a car accident and she was subsequently brought up by filmmaker John Huston (1906–87), her mother's estranged husband (Soma was his fourth wife).
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She played a small role in her brother Danny's film Mr. North.
He was the father of actor and director John Huston, the grandfather of Pablo Huston, Walter Anthony (Tony) Huston, Anjelica Huston, Danny Huston, and Allegra Huston, and the great-grandfather of actor Jack Huston.
John Huston | Anjelica Huston | Huston Smith | Allegra | Walter Huston | Danny Huston | Virginia Huston | Nancy Huston | Gabriele Allegra | Charlie Huston | William Huston Natcher | Valentina Allegra de Fontaine | Thomas Huston Macbride | Nyjah Huston | John Huston's | Jenny Huston | Felix Huston | Allegra Versace | Allegra McEvedy | Allegra Huston | Allegra "Happy" Haynes |