By Philip Blenkinsop BRUSSELS (Reuters) – 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 Two. 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. “Altogether the family is looking for 30 artworks,” said lawyer Imke Gielen. “This is the first that has been …