Warington Spiller, whose tithe was paid along with that of William Spiller in 1724. This implies that he was between the ages of 16 and 20. He is listed after John, and thus assumed to be the younger.
Warrington Spiller: 1751 Michaelmass, 1753 rental rolls, 1754 rental rolls (all in Prince William County) (The 1760 rental rolls is assumed to refer to his son of the same name)