John Masson and Elizabeth Nicol had 9 children between1855 and 1876. all of them except Robert Nicol appear in at least one census with the family, I can find most of their marriages and their deaths. the on-line trees I have seen usually have some of the siblings but not all. I started with a hand drawn tree from my father-in-law - good except he missed some of his uncles and aunts who had died in childhood. I have not tracked one (Agnes) through too many choices - she does not seem to have died in Scotland.
Robert did have a brother Alexander, but he seems to have stayed in the Montrose area. I will check again - Thank you again