If you’re lucky enough to have a big family, there are fewer more agreeable ways to spend a holiday than gathering everyone together in a loud, lively multi-generational melting pot of siblings, cousins and grandparents. The benefits are obvious: for the kids, spending time with favourite cousins means ready-made friends for daytime water fun and evening card games while for the adults, meal preparation takes on a whole new meaning – and there are babysitters on hand if one couple wants to slip out for a spot of sightseeing or a romantic dinner à deux. The question of pooling resources…