A genealogy group has discovered that Barack Obama has an unlikely branch on the right wing of his family tree—Massachusetts senator-elect Scott Brown is his 10th cousin through a 17th-century Bay State ancestor from whom both men's mothers descended. The New England Historic Genealogical Society had previously found the president is also related to seven of his Oval Office predecessors, Brad Pitt, and investor Warren Buffet, reports the Los Angeles Times. (More President Obama stories.)