Sister of Macaulay Culkin, Rory Culkin, Kieran Culkin, Christian Culkin, Shane Culkin and Dakota Culkin.
Niece of Bonnie Bedelia.
Parents are Christopher Culkin "Kit" and Patricia Brentrup.
Played the sister to her real-life brother, Macaulay Culkin, in The Good Son (1993).
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.