Ruby Holler by Sharon Creech
Tiller and Sairy live a quiet life in Ruby Holler; their children have long since left home and things are peaceful. But when they decide to adopt two children from the local orphanage to take on a giant adventure, they form an unlikely foursome. And Tiller and Sairy have to deal with some pretty unconventional behaviour on the part of the children, who don't believe they could ever be 'wanted'. A wonderful, magical story that combines quirky action and adventure with family, loyalty and learning to belong. Winner of the Carnegie Medal.