The New Emily Post Etiquette: The Blue Book of Social Usage

New Emily Post Etiquette: The Blue Book of Social Usage was written by Emily Post who ''was born Emily Bruce Price in Baltimore, Maryland, possibly in October 1872. The precise date is unknown. Her father was the architect Bruce Price, famed for designing luxury communities. Her mother Josephine (Lee) Price of Wilkes-Barre, Pennsylvania was the daughter of a wealthy coal baron. After being educated at home in her early years, Price attended Miss Graham's finishing school in New York after her family moved there.

The New York Times' Dinitia Smith reports, in her review of Laura Claridge's 2008 biography of Post
Emily was tall, pretty and spoiled. [...] She grew up in a world of grand estates, her life governed by carefully delineated rituals like the cotillion with its complex forms and its dances—the Fan, the Ladies Mocked, Mother Goose—called out in dizzying turns by the dance master.

Price met her future husband, Edwin Main Post, a prominent banker, at a ball in a Fifth Avenue mansion. Following their wedding in 1892 and a honeymoon tour of Europe, they lived in New York's Washington Square. They also had a country cottage, named "Emily Post Cottage", in Tuxedo Park, which was one of four Bruce Price Cottages she inherited from her father. The couple moved to Staten Island and had two sons, Edwin Main Post Jr. (1893) and Bruce Price Post (1895).
Emily and Edwin divorced in 1905 because of his affairs with chorus girls and fledgling actresses, which made him the target of blackmail.'' https://en.wikipedia.org/wiki/Emily_Post