Belgium's leading art museum has returned a painting it held for 71 years to the great-grandchildren of a Jewish couple whose property was looted by the Nazis after they fled on the eve of World War II . The family's Berlin-based law firm approached the Musees royaux des Beaux-Arts (Royal Museums of Fine Arts) over five years ago and on Thursday, after a briefing signing ceremony, workers took down the painting and wheeled it off to be packed. Nazi-looted Van Gogh painting could fetch $30 million "Altogether the family is looking for 30 artworks," said lawyer Imke Gielen. "This is...