There seem to be 2 families with the names of the above parents;
1. Alexander Thomson and Mary Clark, children Charles, Margaret, John, Mary Ann, Alexander, emigrated to NSW Australia 24th July 1837 on "Portland", and had more children NSW.
2. Alexander Thomson and Mary Clark, on 1861 Census and 1871 Census Kirkoswald, Ayrshire, Scotland. Various children.
The problem seems to be that these families look to have been 'merged' sharing about 20 children, some of these children are in NSW, and some are born in Scotland after 1837 emigration.
Dates of death for the NSW, Australia, Alexander and Mary are incorrect.
So it's messy. Is anyone able to help to unravel the 2 families please?