Like you I have the parents of George Smail from his death certificate of 1883 in Galashiels as Robert Smail (master blacksmith) and Helen Kerr.
Can't find a marriage for them though.
1841 and 1851 census show George and his first wife Agnes Lillico at Cavers.
Their children were JOHN b. 1835, Roxburgh, MARGARET 1837 Eckford, GEORGE 1839 Caver. TOM 1845 Roxburgh and JANE 1848 Caver
I have sons GEORGE (1839) and TOM (1845) both blacksmiths and both moving south to England where George had 7 children in Kent and Tom had 12.
Likewise I have their brother John (1835) possibly moving to Canada and dying in Saskatchewan in 1919.
1861 census Denholm Cavers shows George aged 50 and his second wife Helen Turnbull aged 30 with children Robert 5, James 4, and Mary 2. They later had Alex 1861, Archie 1863, Helen 1864 and Andrew 1866.
Have been stuck on Agnes Lillico, though Monica might have pointed us in the right direction with her possible parents being William Lillico and Margaret Nicholl.
Cheers
Jen