Hi William
There is a Robert in the 1851 Census matching the birth entry for a Robert in St Cyrys, Kincardine.
He is a visitor at the household of Robert (also a tailor) and Isabella Balfour.
Robert's details are as follows: age 20, a tailor (journeyman), b. St Cyrus. The household address is: 1 Victoria Street, Montrose, Angus.
Regards.
Monica