Betty Washington Lewis

Elizabeth Betty Washington Lewis was the younger sister of George Washington and the only sister to live to adulthood. She was the first daughter of Augustine Washington and Mary Ball Washington. She is considered a founding mother of America.

She was born in Westmoreland County, Virginia and married Fielding Lewis in 1750. Their children included Lawrence Lewis, who married Eleanor Parke Custis, a granddaughter of Martha Washington, and Robert Lewis. They built a house in Fredericksburg, Kenmore House, in 1770, and owned The Lewis Store until 1776. In later life, she stayed close with her mother. She died in 1797 while visiting her daughter, Betty Lewis Carter, at the Western View Plantation in Culpeper, Virginia, and is buried there.

Source: Wikipedia