I'm having a birthday meal with family and friends bank holiday weekend. I'm turning 30 and consider it a big birthday. My sister isn't coming, she would prefer to go away for the weekend to the same caravan she's been to for the last three weekends in a row and hundreds of times before. We're going out on the Sunday, so she could still go Friday to Sunday and come back in time as it's in the evening. Am I unreasonable to think that she should make an effort to come? Or have I got no right to expect anything from her?