I have just booked a once in a lifetime trip to see an old friend in Australia. Having heard about it, someone I know (not a close friend) has asked me if I would mind her booking her elderly mother (80s) on same flight so i can keep an eye on her on the trip (the mum has been thinking of visiting family there but apparently reluctant to travel alone). I really don't want to - this trip is a big treat for me, costing me a lot of money, and with two DCs at home, the flight was going to be some long-awaited me-time. AIBU if I say I can't help? And if not, what on earth do I say without looking like an uncharitable old cow?!