Thomas Calder (1806-1888) & Christian McKenzie (c1821-after 1894)

Hello,

I was wondering if anyone was researching Thomas Calder (1806-1888) and Christian McKenzie (c1821-after 1894). They married on 20th December 1839 and had six children...

Elisabeth c1842
Socilia c1845
Alexander 1845
John 1848
Christina 1851-1933
Isabella 1854

Thomas was the son of Alexander Calder and Susan/Cecilia Cormack (c1771-after 1841). Thomas was the brother of my G.G.G.G. Grandmother Christian Calder (1798-1874). Anyone researching this family? Any help greatly appreciated.

Steven