My sister and I usually go on a summer holiday, with her two young sons and my dd now aged 14. This year the age gap between the boys and my dd seems especially large so I have told my dd she can invite a friend as we are going to go on a villa holiday. Am I being unreasonable to ask the friend's parents to pay for one flight? It would be about £200 max. My sister and I will split everything down the middle and we would not expect any other contribution from the other child's family ( who btw are not friends of mine - it is a school friend of my dd's).My dd has said that this girl's family are "saving for their own holiday" and might not be able to afford it. I read that as perhaps they do not want her to go on hol with perfect strangers - we met once at a parents' evening. or indeed, perhaps really cannot afford it. Should I pay? Why do I feel a bit reluctant ??