Mum and Dad go away for the weekend. It's the first time little sister is allowed to stay behind at home with big brother who is not happy. He was planning a wild party. "OK kids," Dad declared during breakfast on Sunday morning. "Mum and I are going to see Aunt Katie and Uncle Jim next weekend. We will be departing early on Saturday and will be returning Sunday late afternoon. Mark, you're in control. Carly behaves and does what your...