My sister (with her DS) and I live in different countries. Recently she bought tickets to a concert in the UK and asked me to look after her DS while she's at it. The problem is it requires me and my DH (no way I would do this on my own) to take 2 days off work and spend about £500 for flights and hotel to travel to another part of the country. AIBU to refuse? I didn't give her an answer yet and she seems annoyed that I am not very keen to do it but I think the request is a bit excessive. I am struggling to say no as I love her DS very much and she has no one else to look after him really but I honestly don't think I can afford it.