Robert was born about 1715 to Alexander Fergusson and Annie Laurie. His will written 04 Jun 1785 and proved in London 14 June 1798 names Robert’s second family by Mary Cuthbert. The will is online at http://www.nationalarchives.gov.uk/http://www.nationalarchives.gov.uk/
Robert and Mary's children's baptisms are found in therecords of the Cork Unitarian Church recently put online at http://www.unitarianchurchcork.orghttp://www.unitarianchurchcork.org Alexander 23 Dec 1779 Mary 09 Dec 1780 Ellinor 19 Feb 1782
There are a large number of Fergus(s)on who lack documentation to confirm oral traditions that they are descendants of the Craigdarroch Fergusson. Here then are three leads that can be pursued.
In the Fergus(s)on DNA project which I administer we would be particularly interested to know what became of Robert and Mary's son Alexander.