Original: He was the third son and seventh child of John Henry Parnell (1811-1859), a wealthy Anglo-Irish landowner, and his American wife Delia Tudor Stewart (1816-1898); of Bordentown, New Jersey), daughter of the American naval hero, Admiral Charles Stewart (1778-1869) (the stepson of one of George Washington's bodyguards).
Simplified: He was the seventh child of John Henry Parnell and his American wife Delia Tudor Stewart.