Andrew, In the 1851 census of Wilton there is an Andrew CLARK age 3. Details as follows: Address: Wilton Path Robert Clark - Head - Married - 29 - Woolen Frame work knitter - Roxburghshire, Hawick Margaret Clark - Wife - Married - 29 - Woolen Seamstress - Roxburghshire, Hawick William Clark - Son - 8 - Scholar - Roxburghshire, Hawick Peter Clark - Son - 5 - Roxburghshire, Hawick Andrew Clark - Son - 3 - Roxburghshire, Hawick John Clark - Son - 1 Roxburghshire, Wilton If this is your Andrew it would make him 17/18 when he married but that would not be unusual. Can't find an Isabella RIDDELL though in Wilton. I'm stuck with a Catherine RIDDELL shown in the 1851 Hawick census as being born in Hawick, but can't find trace of any parents there. Hope this helps. Pat