All this teenager wanted for her high school graduation was a family trip to Disneyland, but her older sister had other plans for her. Over the past several years, this Redditor found herself having to babysit her sister's kids every time she visited. The family trip to Disneyland was supposed to be her time with her parents doing one final semi-childish activity before going off to college in the fall. Well, her sister decided to crash her event with the kids. It immediately became clear that…