Last post before I log off...
The marriage for Catherine, as we have already, showed:
004542-74 James SHEARS, 28, laborer, England, Parkhill, s/o John and Mary, mar Catharine McDONALD, 28, widow, Scotland, Parkhill, d/o John and Sarah McDONALD, witn L. I. OSBORNE and C. McLEAN both of Parkhill, 26 Feb 1874 Parkhill
http://homepages.rootsweb.com/~maryc/msex74.htmHer death cert in 1918 showed mother as Sarah MCISAAC.
Just wanted to add that MacIsaac and MacDonald are very linked. One of my main lines, from the Western Highlands, were originally MacIsaac. By the mid 1850s to the 1880s, the surname had converted to MacDonald. Many BMD registrations would show both surnames, for example Angus MacIsaac or MacDonald.
Monica