The GENEALOGY ROADSHOW team connects Detroit citizens to world events with ancestral findings at the Daley Rhea Mansion in "Motor City." A Ford Motor Company's first female design engineer learns details of her parents' secret World War II activities and her father's untimely death. A Mexican-American woman discovers the truth both about her family's groundbreaking presence in Michigan and a Civil War-era ancestor charged with murder. A long-held question about a woman's relation to Abraham Lincoln is answered. And a husband's amateur sleuthing gets a once-over from ROADSHOW researchers who confirm his wife's connection to a legendary explorer.