The author became interested in his family genealogy through inherited documents and records, and was inspired to update the material on the descendants of John Grosvenor. John Grosvenor's ancestors can be traced back thirteen generations in England to Adam Grosvenor of Shropshire County, England, who lived during the time of Edward I. The book begins with a brief history of the Grosvenor family until 1670, when John went to America and worked as a tanner in Roxbury, Massachusetts. John married Esther Clark, and their children were the first of ten generations of his descendants. These generations include more than 800 people born with the Grosvenor name. John bought property in Connecticut and his family moved there after his death. They soon branched out and many Grosvenors lived in Schoharie and Montgomery Counties of New York and Geauga and Miami Counties of Ohio. The first generation begins with John Grosvenor. The following information (if known) is given for each individual: birth and death dates, place of birth, vocation, and marriage status. Every family member for the entire ten generations is assigned a number, and selected lines are carried through. Also, a list of sources and an index of over 2000 names are provided.