US First Lady Michelle Obama's ancestry can be traced to a slave owner from what is now Northern Ireland, who emigrated to America in the 1700s. A new book claims that Andrew Shields, who fought against the British in the American War of Independence, was Mrs Obama's great-great-great-great-great-great-grandfather and his family were slave owners. Her great-great-great-grandmother Melvinia was a slave who had children by Charles Shields, grandson of Andrew Shields. One of those children, Dolphus Shields, born in 1859, was Michelle Obama's direct ancestor. The claims are made in American Tapestry: The Story of the Black, White and Multiracial Ancestors...