No children listed in 1911 census for Alexander and Harriett.
Possible sighting of James Pugh (Sarah's husband)-
James Joseph Pugh, age 77, born England, wid., died 7 June 1916 Ontario, buried Aurora Co. [note: Aurora is just north of Toronto]
If so this might be him in 1911-
3 Miller Ave., Toronto, York South, Ontario
James Pugh born July _ age 68 wid.