Planning family vacations is never fun, especially when one teen makes it her mission to hate everything the family loves. So when Mom was organizing a Disney trip for her kids and nephew, who’s fighting cancer and has been dreaming of this experience, she wasn’t surprised when her 16-year-old stepdaughter immediately shot down the idea. The stepdaughter has a bit of a pattern—she’ll dismiss any plan that others enjoy, whether it’s a zoo trip or a family meal, just because others are happy. Aft…