- Sister of Macaulay Culkin, Rory Culkin, Kieran Culkin, Christian Culkin, Shane Culkin and Dakota Culkin.
- How she got her name: Quinn is for Kit's old friend and someone he considers like a father, Anthony Quinn, also because she is the fifth child. Her middle name Kay is for her maternal grandmother.
- Played the sister to her real-life brother, Macaulay Culkin, in The Good Son (1993).
- Niece of Bonnie Bedelia.
- Originally expressed interest in pursuing an acting career just like her brothers, which led to her role in The Good Son (1993). Ultimately, she chose not to pursue a full-time acting career and followed her other interests.
- Parents are Kit Culkin and Patricia Brentrup.
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