I am reasonably certain Matthew had a sister Flora and brother Archibald - both of whom came to Australia and were living nearby in the Laggan - Binda region.
Flora was married to Neil McKinnon. Sleat registers record that this was 24 April 1832. Entry states Niel McKinnon shepherd Gillen and _ McDonald.
Her cousin Alexander Macintosh of Binda provided the information for the death Certificate of Flora (died 26 April 1887). He stated her father was Charles McDonald but did not know the mother's name. From other information I have established that Alexander Macintosh was the son of John Macintosh and Flora McDonald. A newspaper announcement Inverness Journal Friday 26 September 1817 states that
Married - At Brachlich in Morar, on 30th day of August last, Mr John Mackintosh, Surveyor of Taxes. Fort William, to Miss Flora Macdonald, youngest daughter of Doctor Alex.Macdonald, Gillin, Sleat. This is correct for Alexander's parents so in a tortuous path establishes that Charles was indeed the father of Flora and Archibald.
Our family always claimed a connection with descendants of Charles 2nd family who were in Victoria.