- Father of Shane Culkin, Dakota Culkin, Macaulay Culkin, Kieran Culkin, Christian Culkin, Quinn Culkin and Rory Culkin.
- Brother of Bonnie Bedelia, Candace Culkin and Terry Culkin.
- He had a daughter from another relationship named Jennifer Adamson. Adamsom died in 2000 aged 29 from a drug overdose.
- His paternal grandfather was of Irish descent, and his other ancestry includes German, English, Swiss-German, and French.
- Was in a relationship with Patricia Brentrup for 21 years (1974-1995), but they never married.
- Played the role of the "Nutcracker Prince" (his wife played "Marie") in George Balanchine's production of "The Nutcracker". His legendary son, Macaulay Culkin, played the same role years later in the major motion picture adaptation of George Balanchine's The Nutcracker (1993).
- Ex-father-in-law of Rachel Miner.
- Brother-in-law of Michael MacRae.
- Ex-brother-in-law of James Telfer and Ken Luber.
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