Thomas, the first born of Thomas McCreath and Agnes (Ann) Gibson was born on 20 October 1803, at Ayr.
His sister, Marion McCreath was born on 20 June 1805 at Burnmouth, Maybole.
Neither Thomas nor Marion married.
Thomas took over responsibility for Bellesley Hill Farm from his father.
Thomas died (67) at Bellesley Hill on 26 April 1867, he was unmarried. His brother, James McCreath, of Stobcross Farm, Sandyford, Glasgow was the informant.
Marion McCreath died (82) on 17 August 1884 at 8 New Road, Newton, Ayr, The informant was her niece, Jane/ June? Mair of Crofthead, Tarbolton.
In the 1851 Census Thomas and Marion are listed as resident at Bellesley Hill, Newton on Ayr with their mother as Head of the household:
Ann McCreath 85 Head
Thomas McCreath 49 Son
Marion McCreath 45 Daughter
Charles McCreath 6 Grandson
Charles McCreath would have been the child of her son, James McCreath (1807-1879), farmer at Stobcross, Glasgow and Jane Allan (1820-1895)