Son of George Durham and Ann (-----)
Born ca. 1837 in [Kent Co.], Delaware

Isaac's age in the census records: in 1850, age 13.
In 1850 Isaac resided in the household of Henry and Rachel Durham.
Isaac was a younger half-brother of Henry Durham. See Kent Co. Orphans Court records, Vol. P, p. 449, 452.

1850 - U.S. Census, Delaware, Kent Co., Dover Hundred, Page 176, 1354-1355, 04 Oct 1850