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Culkin was born in New York City, the son of Patricia Brentrup and Christopher 'Kit' Culkin, a former stage actor with a long career on Broadway. Culkin is the youngest of eight children; he has four brothers: Shane (b. 1976), Macaulay (b. 1980), Kieran (b. 1982), and Christian (b. 1987), and three sisters: Jennifer (1970–2000), Dakota (1979–2008), and Quinn (b. 1984). His sister Jennifer had a different mother. Culkin is a nephew of actress Bonnie Bedelia, who is his father's sister.

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