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In 2000, Claude Cassirer, a San Diego resident, was astonished to learn that the painting that he remembered from his grandmother’s apartment in Berlin was hanging in a museum in Madrid.

“As a Holocaust survivor, the proudest day of my father’s life was in 1947, when he became a U.S. citizen,” Cassirer said.

David Cassirer, his son, took over as lead plaintiff in the family’s case after his father’s death in 2010.

David Cassirer, 69, the lead plaintiff in the case and Lilly Cassirer’s great-grandson, deferred comment to his family’s longtime attorney, Sam Dubbin, who told The Times they were “surprised and disappointed by the decision.”

In 1911 it was sold to the Berlin art dealer Paul Cassirer.