I did a search of the Canadian census of 1871, 1881 and 1891 at familysearch.org for a William HUSTON, born between 1865 and 1870 and these are the results listed in the index. If you want me to search further for any of these, repost your query to this board.
William Huston Canada Census, 1891
birth: 1868 Ontario
residence: 1891 Huron, Bruce West, Ontario, Canada
William Huston, Son, Canada Census, 1891
birth: 1867 Ontario
residence: 1891 Gloucester, Russell, Ontario, Canada
William Huston, Son, Canada Census, 1891
birth: 1867 Ontario
residence: 1891 Gloucester, Russell, Ontario, Canada
William Huston, Canada Census, 1871
birth: 1869 O
residence: 1871 Huron, South Bruce, Ontario, Canada
other: Jane Ann Finlay
William George Huston, Canada Census, 1871
birth: 1869 O
residence: 1871 Huron, South Bruce, Ontario, Canada
other: Gordon Huston, James Henry Huston
William Huston, Canada Census, 1871
birth: 1869 O
residence: 1871 Huron, South Bruce, Ontario, Canada
other: Neman Huston
William Huston, Canada Census, 1871
birth: 1869 Q
residence: 1871 Ste-Anne Ward, Montreal West, Quebec, Canada
other: William Huston, Jessie Huston, Margaret Huston
William Huston, Canada Census, 1871
birth: 1866 Q
residence: 1871 St-Raymond, Portneuf, Quebec, Canada
William Huston, Employee, Canada Census, 1891
birth: 1869 New Brunswick
residence: 1891 Waterford, Kings, New Brunswick, Canada
William Huston, Canada Census, 1871
birth: 1870 O
residence: 1871 Ramsay, North Lanark, Ontario, Canada
other: Joseph Huston
William Huston, Canada Census, 1881
birth: 1868 Ontario
residence: Hawkesbury East, Prescott, Ontario, Canada
other: Duncan Huston, Nansey Huston, Maggie Huston
William Huston, Canada Census, 1881
birth: 1869 Ontario
residence: Maryborough, Wellington North, Ontario, Canada
other: William Huston, Priscilla Huston, Eliza Huston, Zadock Huston, Anne Huston, Georg Huston...
William Huston, Canada Census, 1881
birth: 1869 Ontario
residence: Huron, Bruce South, Ontario, Canada
other: William Huston, Charlotte Huston, Jane Emelinis Huston, Isabella Ann Huston, Agnes Ellen Huston, James Gordon Huston...
William George Huston, Canada Census, 1881
birth: 1869 Ontario
residence: Huron, Bruce South, Ontario, Canada
other: Sarah Jane Huston, James Henry Huston, John Gordin Huston, Mary Maud Huston, ... Huston