This summer, the footballer Lionel Messi chose to honeymoon with his extended family, rather than just his new wife. In an increasingly fast-moving world, multi-generational travel offers a chance to step off the wheel and spend time with those who matter most. For parents, taking the grandparents potentially means free childcare. It's also the perfect way to celebrate a milestone birthday, a retirement or an anniversary. Whatever the reason, quality time with your loved ones is a given. Here are some suggestions.