Andrew Orkin, a Canadian attorney, and Orkin’s family, have sued the Swiss government and a Swiss museum for a Vincent Van Gogh pen-and-ink drawing they say their great-grandmother sold under duress as her family tried to flee the Nazis in their native Germany. Orkin claims Oskar Reinhart, the Swiss art collector who bought the drawing and bequeathed it to the Museum Oskar Reinhart am Stadtgarten, took advantage of his great-grandmorhter’s dire circumstances and bought the drawing for considerably less than its market value.