Katie and the Impossible Cousins

"Katie is a little nervous when her stepfather's relatives come for a visit. After all, the thirteen-year-old cousin, Noelle, attends a Swiss boarding school, and her life ifs very different from Katie's. But Katie introduces Noelle to her friends, and everyone starts having fun together. the real trouble begins when Noelle's mother and grandmother decide that they don't like Katie or her friends." Taken from back of book.