Reuben 1 in my early uninformed list is the father of Reuben 2, who is the father of Reuben 3.
Of Reuben 2 and 3, Jack MacDonald says this:
378. Reuben Allen.
Reuben Allen [this is Reuben 2], the son of Reuben [this is Reuben 1] and Mary Allen, was born in about 1722 in Cecil County, Maryland.He was later married in Virginia to a woman named Ingaborg Hughes.
In 1747, Reuben purchased 400 acres of land from his Uncle, Benjamin Allen, and in 1749 he received a Fairfax Grant for an additional 600 acres. Reuben subsequently died in 1751 in that portion of Augusta County, Virginia that was later formed into Shenandoah County, Virginia.After Reuben passed away, Ingaborg married for a second time to a man named John Skeen.
790. Reuben [this is Reuben 3] b. in 1748 in Augusta Co., VA. m. 1768/69 to Lydia Moore in Frederick Co., VA. d. 1779 in Shenandoah Co., VA.