I had no luck finding their marriage, reported on the birth registry to be in 1854, either of their deaths (some possibles at SP by searching the whole country with wildcards for their names, but not definites), or any listing on the 1861 census, when my g g grandmother would have been 5. This may well be a result of my novice searching abilities.
The best possible hit is this one:
Jessa McRae age 25, relationship to head: wife
Duncan McRae 2
Isabella McRae 5
Mary Ann McRae 3
From Mary Ann's birth registry, she would have to be five, not quite six, at this census, and appears from her birth registry to be the eldest. (The registrar listed the number of living and deceased children for the other families on the page but not for her parents and one other recently-married couple.)
I know it's common for ages to be wrong on census entries, but it seems odd for young children, where the parents would have a pretty good idea of the correct age. Is it common to see this error for children as well?
This is really the only listing that's even close, so I'm really hoping it's the right one.
Kathy