According to "A Biographical Sketch" by Mrs. Hugh Fraser, included in the introductory material to Warriors of old Japan, and other stories, Ozaki came from an unusual background. She was the daughter of Baron Ozaki, one of the first Japanese men to study in the West, and Bathia Catherine Morrison, daughter of William Morrison, one of their teachers. Her parents separated after five years of marriage, and her mother retained custody of their three daughters until they became teenagers.