The Exiles At Home — Hilary McKay

When Ruth Conroy decides to sponsor a child in Africa, she is unprepared for the difficulties involved in finding GBP10 a month. So she enlists the help of her sisters - Phoebe, Naomi and Rachel - who are only too eager to dream up hare-brained fund-raising schemes ...Undisciplined baby-sitters, unhygienic caterers or fraudulent pavement artists, their hilarious projects never fail to cause chaos and mayhem.