I listened to her, and thought, as only a bachelor uncle can: “That’s just the sort of admonition that sets kids up for failure. Of course they’d eventually get my car dirty. Kids can’t help it.” So I made things easy. While my sister was outlining the rules, I slowly and deliberately opened a can of soda, turned it over, and poured it on the cloth seats in the back of the convertible. My message: People are more important than things. A car, even a pristine gem like my new convertible, was just a thing.