Between 2014 and 2021, Tino and his grandmother Aida exchanged over three hundred letters. The Syrian widow initiated the tradition when her grandson moved to Toronto. She terminated it when she urged him to return there. Tino's biggest mistake: in 2016, he defied his parents and renounced becoming a Canadian citizen. Aida's deepest regret: in 1962, she obeyed her parents and renounced becoming a singer. The source of their suffering:...