There are two kinds of dads—the ones who have embraced mobile ordering at Starbucks and the ones who drive around holding an open mug of black coffee from home, raising it in the air when they go over a bump so it doesn’t slosh and get on their dress pants. Ones who, when they receive a thermos you’ve given them for Christmas, a perfect gift in its father-friendly practicality, will study it at arm’s length and say, “Ah, very nice,” which means they’re going to return it. My sister Caroline has