Unveiling Hidden Branches: A Genetic Study of George Washington’s Extended Family Tree

This presentation provides an in-depth look at the groundbreaking genetic research that identified unmarked graves at the historic Harewood plantation, home of President George Washington's brother, Colonel Samuel Washington. Participants will learn how FamilyTreeDNA's multi-marker DNA approach—combining Y-DNA, mitochondrial DNA, and autosomal DNA analysis—successfully confirmed the identities of those interred at the site, including Dr. Samuel Walter Washington, his brother George Steptoe Washington Jr., and their mother Lucy Payne. Beyond the published findings, this session explores unexpected discoveries that emerged from continued Y-DNA testing. We'll examine newly formed subclades and investigate an intriguing genetic match with a descendant carrying a different surname. Through careful analysis of census records and historical documentation, we'll trace how this family—identified as white in later generations—descends from the mixed-race child of a Washington family male and an enslaved woman. This case study demonstrates how genetic genealogy can reveal hidden branches of prominent American families while illuminating the complex realities of ancestry, race, and enslavement in early American history. Sponsored by FamilyTreeDNA