At the end of January I'm looking after three children for 24 hours whilst their parents are away. The parents are friends of my family and when I've looked after their children before I've charged £5 an hour but when speaking about looking after the children for 24 hours they suggested they'll pay me £20 for the day and night. Should I query this? Usually I don't mind being charged less as I understand that some people can't afford it but I'm starting to think I may be taking advantage of? The children are 9, 12 and 13 and I have childcare qualifications. Thanks for your help!