Are we there Yet?
Written by Verna Wilkins
Illustrated by George McLeod & Lynne Willey
http://www.randomhouse.co.uk/catalog/bookcb.htm?command=Search&db=main.txt&eqisbndata=187051629X
Max and Amy are really excited when they learn that their dad has planned a surprise trip to a theme park but it seems that they’ll never arrive. The father in this story is an active and much adored man who has a physical disability.