Jack adopted my parents while I was attending college in Florida, to the chagrin of Charlie, who had become used to being the only cat in my parents' Maine household.
During my periodic home visits, I got to know Jack only somewhat: he regarded me as a temporary guest, and I spent most of my time with my buddy Charlie.
Jack's lightweight build and aloof personality reminded me of Blondie. Jack's shyness suggested that he had been abused before he joined our family. Even his voice was downtrodden - his “meow” was very low-pitched and creaky.
Jack stayed with my parents until he was overcome by old age. My parents were then catless for a couple years, until Sophie found them.