Frederick Frost was the son of William Frost and Mary Anne King, and hence a half-brother of William Webb-King (through whom we descend). He was probably born at Laundry Cottage, Essendon, Hertfordshire. He married Martha Anne Chapman (born in Ware, Hertfordshire) in 1874, in Collingwood, Ontario. She died in 1895, and he remarried.
Frederick was a clergyman and a teacher - a Canon of the Anglican Church in Canada. He emigrated to Canada in 1872 with the Reverend E.F. Wilson. He is listed as a 'bootmaker' in the English 1871 Census, age 20. Near Sault Ste. Marie, Ontario, Frederick taught at the Shingwak Industrial School on the Garden River Indian reservation. The school burned, six days after it opened, but he stayed on as a catechist. He was, indeed, a missionary priest.
His second wife, Dorcas Young (born ca 1878) was 25 years younger than he - so that there is 100 years between him and his youngest grand-daughter. William married Dorcas on the Sheguidandah, Ontario Indian reserve, 7th February, 1897.
Children through his first wife, Marie Chapman, were: Charles Henry, Nellie, William Armiger, Ethel Maude, and Weston.
His children through his second first wife, Dorcus, were: Emma, Blanche, Frederick Lawman Frost (died in infancy - 1911), and Allan Edward Frost.
Canon Frederick Frost died in 1922.