Hi Moorlands,
Found a little on Mary Ann Cox who was Mary Ann Grant married to George Cox in Freemont. Colorado on the 1 st December 1912.
George Cox was the son of Robert Cox born about 1836 in Birtley, County Durham, England and died 1889 in Fremont County, Colorado. The Mother was Mary Ann Collins born August 1841 in England and died 25 May 1912 in Fremont County, Colorado.
Mary Ann was the daughter of Charles George Grant born 7 April 1862 in Gilfach Goch, Rhondda Cynon Taff, Wales and died 14 APR 1945 in Florence, Colorado. Charles married Mary Jones in 1884 (according to the 1900 Census) in Gilfach goch South Wales.
Mary Jones was born 6 September 1862 in Wales and died 11 April 1943 in Florence, Colorado.
Mary Ann Grant and George Cox appear to live in Colorado in 1920 and 1930.
Apart from the Welsh connection, can't see anything else to link Mary Ann Cox to William Pritchard at the moment.
Sandra