I bought my mum a weekend for two in a hotel with a murder mystery theme night, for Christmas. I told her it would be great if she took a friend and had a nice time, but if she couldn't find a friend who could go, then I would be very happy to go with her. She found a friend and I helped her book it for next June. Everyone was happy. Then a month ago my sister phoned to say that my mum's friend could no longer go and that she was going instead. I was a little upset and so I asked my mum about it and she confirmed that my sister was going. I reminded her that I said I would be happy to go if her friend couldn't and she got angry and told me that I'd said it was her choice. So her words confirmed to me that she chose to go with my sister instead of me. The way I see it is that she has chosen between her two daughters rather than just going with 'the person who bought the tickets'. I was a bit upset on the phone and now both my mum and my sister haven't spoken to me for more than a month.(Incidently, I bought my sister two days in a spa hotel in the Swiss Alps for Christmas so it's not like she was missing out.) Do you think I am wrong to be upset by this? Should I apologise?