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In page Dolores Costello:
"Dolores Costello was born in Pittsburgh, Pennsylvania, the daughter of actors Maurice Costello[1] and Mae Costello (née Altschuk). She was of Irish and German descent. She had a younger sister, Helene, and the two made their early film appearances from 1909 to 1915 as child actresses for the Vitagraph Film Company. They played supporting roles in several films starring their father, who was a popular matinee idol at the time.[citation needed]
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