The Robert Armour you are talking about I believe is the brother of Elizabeth Armour, my gggggrandmother.Her parents were James Armour and Janet Raeburn (Rayburn - name varies)and they had the following children, Elizabeth, Ann, Andrew, John, Anne, James, Anne Sawer, Patronella Helen, Janet, Robert, Jean and finally Margaret.
Robert married Charlotte Frew on 6 July 1834 in Irvine, Ayr, Scotland and her parents were Francis Frew and Margaret Wilson.
I descend from Elizabeth's marriage to John Armour (m.26th Nov 1816), who had the following children:
Helen Armour b. 28th Dec 1826 in Kilmarnock John Armour b. 8 Jul 1824 Andrew Armour b. 5 Jun 1829 Robert Armour b. 16 Jan 1837 (m. Jean Armour b. 27 Jul 1841
Helen married a John Maillie on 6th Dec 1844 (b. circa 1832 and d. 11th Dec 1879 in Calton, Glasgow).
If you think this is a match then give me a shout, same goes for anyone else who recognises these names