Kieran Kyle Culkin was born September 30, 1982, and started working in 1990. He worked with his brother, Mac several times. His debut was playing Mac's cousin, Fuller, in Home Alone. He went on to do lots of films on his own. He starred in Father of the Bride playing Steve Martin's young son. Then a few years later they offered him a special role in The Mighty. After his wonderful performance, he went on to bigger movies like The Cider House Rules and Music of the Heart.
Brother of Macaulay Culkin, Rory Culkin, Quinn Culkin, Christian Culkin, Shane Culkin and Dakota. Parents are Christopher Culkin "Kit" and Patricia Brentrup. Aunt is Bonnie Bedelia. He and his brother Rory Culkin each appeared in a film titled "It Runs in the Family" (Kieran in It Runs in the Family and Rory in It Runs in the Family). Played the cousin of his brother Macaulay Culkin in Home Alone and Home Alone 2: Lost in New York. His younger brother Rory Culkin played the younger version of his character Igby in Igby Goes Down.