Us by David Nicholls

 Douglas and Connie, two fiftysomethings from Berkshire, are going on a modern version of the Grand Tour with their 18-year old son, Albie, after which he will go away to college. On a route which takes in Paris, Amsterdam, Munich, Venice and Florence they will see improving works by Rembrandt, Vermeer, Raphael, Titian, da Vinci and so forth.…