My kids are teenagers now, but we've been taking them on cruises since they were tiny. Each time we returned from our days at sea, I told my husband how much I wanted to take his parents on a cruise with us, as it seemed like the perfect multigenerational vacation to me for a variety of reasons. My father-in-law passed away unexpectedly last year, and the devastating loss made me even more determined to get my mother-in-law, who my kids call Grammy, onto a cruise ship with my family.