The athlete has an elder brother Kevin Cook and a younger sister, Kerri Cook.
Her brother played soccer at Sam Barlow High School and the University of San Diego before becoming a coach for Seattle United.
Moreover, her younger sister followed in her footsteps at Oregon University.
She later enrolled at Middle Tennessee State University. Currently, she is the soccer team captain, in addition to majoring in nursing.
Kiyomi loves to keep her personal life away from the public’s eye, as a result, she has not revealed much about her parents.
However, we all know that her father and mother are her biggest supporter.
