One of these children is two years older than the other. One of them is stuck on the floor once down there, the other chooses to stay close. One grows tall and strong; the other is twisting and turning more each day. Both of them have a vocabulary made up of lovely words like "Writed" and "Fallded", and neither of their mothers can immediately tell which is talking. Different schools, different towns, different churches, different life experiences. But whether they are using the Force (of the power chair to practice flying), or sharing disgustingly chewy sweets, or just finding new ways to fool monsters into eating broccoli. they manage to skip through all the differences and just enjoy each others' company.
To quote the young man, in an earlier conversation with his mother "Every one should have a friend who is disabled, and if they don't, it is a shame."