Robert Heron & Thomas Heron

According to our family Records, my great grandparents were Thomas Heron (b. 11/5/1838) in Kalewater-Foot, Eckford, Scotland. He was baptised on 12/9/1838 and immigrated to Ontario, Canada in 1855.

My great great grandfather was Robert Heron b. 3/28/07 in Eckford, Roxburgh, Scotland and baptised on 4/15/1807. He was married on 9/22/1832 in Eckford.

He married Janet "Jean" Lawrie born 5/18/1802 in Yetholm, Roxburgh

We think my great-great-great grandfather was Robert Heron b. 3/17 or 4/11/1779, not certain where. He was married in Eckford on 5/13/1806 to Janet Cairns who was baptised on 10/27/1782.

We do not which line of Herons Robert Heron was a descendent of. We cannot find who were the parents of Robert Heron.

Any help would be appreciated.