There are a few possible baptisms for James as we only have a very rough year of birth from the 1841 census. There is a will on Scotland's People for James Robertson farmer and grazier, sometime in Ballinloan, thereafter residing at Glenlyon House, 27 Mar 1848, so it doesn't look likely that we will find him on the 1851 census to get a better idea of when he was born. And I don't suppose his will would mention a sister if he had children.
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