Family vacation. The phrase either inspires excitement or incites fear among adults who are lucky enough to still have their parents and siblings around and still want to hang out with them. Sometimes it triggers both disparate feelings in equal measure. Getting to spend uninterrupted time with our loved ones is a privilege! But it can also be challenging, and I've heard plenty of horror stories from friends and colleagues about well-intentioned trips which have ended in rather frosty flights home. I'm lucky: I've traveled extensively with both my sister Emily, who's three years older than me, and my mom. Emily and I have spent a week in Paris following a break-up and in New York, trotting through Central Park, clutching bags from Magnolia Bakery and attempting to get the perfect photo holding a frosty Martini glass. My mom has been my chosen plus-one for some of my glitziest work trips: a sleepover at Le Manoir aux Quat'Saisons, a weekend in Cannes, and 24 hours on the Venice Simplon-Orient-Express.…