Genealogist: Obama, Mass. Sen.-elect Brown related - Yahoo! News BOSTON â€“ It was bad enough that President Barack Obama lost his filibuster-proof margin in the U.S. Senate to a Republican. Now it turns out he also lost it to a relative. Genealogists said Friday that the Democratic president and the newly elected senator from Massachusetts, Scott Brown, are 10th cousins. The New England Historic Genealogical Society said Obama's mother, Stanley Ann Dunham, and Brown's mother, Judith Ann Rugg, both descend from Richard Singletary of Haverhill, Mass.