Ruby Holler by Sharon Creech
Tiller and Sairy live a quiet life in Ruby Holler, their children have long since left home and they are happy with their routines. Until one day they each decide they want to undertake a big adventure and they need companions to accompany them. And now it gets exciting because they adopt two children from the local orphanage and form an unlikely foursome for the children can not believe they are really 'wanted' and Tiller and Sairy have to deal with some pretty unconventional behaviour on the part of the children. A wonderful, whimsical and magical story that combines quirky action and adventure with the important themes of family and loyalty and learning to belong.