Why a Luxury Cruise May Be the Answer to a Stress-Free Family Vacation : Planning a family vacation can be daunting, especially when you want to ensure everyone has a relaxing and enjoyable time. If taking it easy is a priority for you during a family trip, then a luxury cruise might just be the perfect solution. Fortunately, luxury cruises have been growing in popularity lately. According to the Cruise Lines International Association, cruise ship passenger numbers have grown from 17.8 million to 30 million since 2009, and this demand has already been reflected in the sheer amount of expedition cruising companies that have entered the market. But how does a…