The cause is personal for Msgr. Cassato. One night in 1953, David Cassato, then 5 years old, was headed home from his grandparents’ house. He turned to his father and asked about a photo he had seen. That night, he first heard about Mother Cabrini, who had helped Msgr. Cassato’s grandparents when they came from Sicily to the Lower East Side of Manhattan on 1910 with nothing.