So this is what I know (from mainly Scottish parish records and Canadian censuses):
William McDonald, born about 1782 in Scotland -- a plasterer by trade -- married Sara Davies in Inverness on 6th January 1806. They had the following children (that I have been able to trace):
Thomas (baptd 1806 Inverness)
Duncan (baptd 1808 Inverness)
Alexander (bapt 1809 Inverness)
William (born c1817)
Sarah Ann (born c1823)
Margaret (born c1824)
Jane (baptd 1826 Inverness)
Trees on Ancestry name a couple other children but without any source records.

I refuse to count them.
William was still living in Inverness in 1828.
William's son Duncan married Ann Jordan in Ontario in February 1834. (No idea whether the rest of the family had emigrated to Canada by this time. For what it's worth, none of them were witnesses at the wedding).
The next record I have found relating to William is the 1852 census, which has him in Perth, Lanark County, Canada -- by which time he is widowed. (I have found no record of his wife's death in either Scotland or Canada). I cannot find any reference to any additional children that he might have had after arriving in Canada.
His daughter Jane's 1906 obituary, however, refers to her having been "one of a family of thirteen children".
So who are these other children, and where were they born?!
Please can anyone suggest any additional (and preferably free!) Canadian sources (ie aside from census records and what Ancestry throws up) that I can hunt in for further references to this family? Or can anyone else find any additional children (with firm sources, of course!) for William?
Many thanks.
CELTICANNIE