Agnes Steven (1820-1910) who married Alexander Scott (1817-1891). Are you paying attention!?
Of course!
My direct line is Scotts from East Kilbride.
John Scott married Mary Lindsay in EK in 1764.
Their son William married Margaret Craig in EK in 1796.
Their son Alexander married Margaret Aitkenhead in EK in 1837.
Their son Alexander married Elizabeth Wilkie in Airdrie in 1874.
Their son Alexander was my grandfather.
I am not related to any Warnocks older than the family of John Warnock (1845-1931) and Agnes Scott (1839/40- 1872) so I have not studied the earlier generations of Warnocks.
I see from the 1881 census that your Alexander Scott was allegedly born in 'Mattuch', Banffshire. I assume that this is Mortlach, and I note that Alexander, son of Peter Scott and Margaret Grant, was baptised in Mortlach on 15 January 1817. In which case your Alexander is not related to my Scotts either.