Watch the video to learn more about Di Clemente's journey.
During today's Remembrance Day activities at McGill University, Josée Di Sano told CBC Montreal reporter Leah Hendry the story of her grandfather.
Federico Di Clemente was a soldier in the Italian army who escaped prison in Austria during the Second World War.
"After the war, his wife said, 'He's not on the injured or dead list, so he must be somewhere, and I'm sure he'll come back,'" Di Sano recounted.
"Sure enough, one day she saw someone very skinny walking and holding his pants because they were falling off, and she said, 'That's my husband.'"