Whether you and the in-laws share belly laughs or strained conversation, there are challenges to travelling together. Back under the watchful eye of parents, your sophisticated partner might metamorphose into their surly teenage self. And you might feel under the spotlight too, particularly if you don't know them well. But you can survive awkward small-talk on long-haul flights, navigate tensions, and emerge looking even more saintly than before (or realistically: not tarnish their woeful impression of you further). These survival tips are easier said than done, but it's time to put on a clean shirt and a winning smile, and breeze your way through a family trip.