Robert Decatur Isreal is my 4th greatuncle. I have his parents as Joseph and Mary (Witherspoon) Joseph b.1793 in Pa. Mary b.1790 in New Castle, Pa. Then I have Joseph's parents Joseph b.1769 married Hester Thompson b.1770 in Philidelpia, Pa Joseph's(1769) parent's are Isreal Isreal b.1746 in Phili.,Pa. d.3-8-1822 in Phili.,Pa. wife is Hannah Erwin b. 6-24-1756 d. 12-4-1813., Israel (1746) parents are Michael b.abt.1720 d.7-8-1754 married Mary Paxton b.5-22-1754 d.12-29-1777.
Robert has 5 other siblings: Adeline b.1812 d.1896 Hesterb. 1819 Agnes b.1821 Isaac b.1820 Joseph Perry b. 1822 d.1898 Thats about far back as i can get don't know if you already have this info it's been awhile since you posted this. If you have other info sure would take any help.