- Brother of Shane Culkin (b. 1976), Dakota Culkin (1978-2008), Macaulay Culkin (b. 1980), Quinn Culkin (b. 1984), Christian Culkin (b. 1987) and Rory Culkin (b. 1989).
- Played the cousin of his brother Macaulay Culkin in Home Alone (1990) and Home Alone 2: Lost in New York (1992).
- Was in a relationship with Emma Stone (October 2010-June 2011).
- His younger brother Rory Culkin played the younger version of his character Igby in Igby Goes Down (2002).
- Nephew of Bonnie Bedelia.
- Father, with his wife Jazz Charton, of a daughter Kinsey Sioux Film, born September 13, 2019.
- Appearing with Anna Paquin in the off-Broadway dark comedy "After Ashley". (March 2005)
- Played the older brother of his brother, Rory Culkin, in Lymelife (2008).
- In London, West End, performing alongside Colin Hanks in "This is Our Youth". (December 2002)
- He and his brother Rory Culkin each appeared in a film titled "It Runs in the Family" (Kieran in My Summer Story (1994) and Rory in It Runs in the Family (2003)).
- Father is Kit Culkin (Christopher Culkin) and mother is Patricia Brentrup.
- His father is of one quarter Irish, as well as of German, English, Swiss-German, and French, descent. His mother is of half German and half Norwegian ancestry.
- Born on the same date as Lacey Chabert.
- Ex-brother-in-law of Rachel Miner.
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