Sister: You are a skinflint. The bill came to almost exactly a nice round number per person, including my kids who didn't drink alcohol and your lot did, but I wasn't bothered. I put in £20 over the top to cover a tip of £10 for the five of us. You were very cagey about being able to split a £20 note to give me back a tenner. Someone else duly obliged. Then, because you'd offered to pay on your card, you made a big show of putting in a £10 tip. In other words, the seven of you offered nothing as a tip. This was not an oversight, you have previous...