When Thomas Graham was born in 1816, in Delaware, United States, his father, Robert Graham, was 42 and his mother, Catharine Russell, was 41. He married Mary Jane Fleming on 8 February 1841, in Adams, Illinois, United States. They were the parents of at least 3 sons and 1 daughter. He lived in Bear Creek Township, Hancock, Illinois, United States for about 39 years. He died on 28 June 1894, in Denver, Hancock, Illinois, United States, at the age of 78, and was buried in Graham Cemetery, Bear Creek Township, Hancock, Illinois, United States.