Dorothy May Day was born on November 8, 1897, in the Brooklyn Heights neighborhood of Brooklyn, New York. She was born into a family described by one biographer as solid, patriotic, and middle class. Her father, John Day, was a Tennessee native of Irish heritage, while her mother, Grace Satterlee, a native of upstate New York, was of English ancestry. Her parents were married in an Episcopal church in Greenwich Village. She had three brothers (including Donald S. Day) and a sister and was the third oldest child. In 1904, her father, a sportswriter devoted to horse racing, took a position with a newspaper in San Francisco. The family lived in Oakland, California until the San Francisco Earthquake of 1906 destroyed the newspaper's facilities, and her father lost his job. From the spontaneous response to the earthquake's devastation, the self-sacrifice of neighbors in a time of crisis, Day drew a lesson about individual action and the Christian community. The family relocated to Chicago.