Sharing for many children is a very difficult concept, and children with additional or different form needs will really struggle. Children need to use their rational brain, also known as the "frontal lobes" to have self-awareness, kindness, empathy and concern. In children who have emotional challenges this part of the brain may not work so well and they may use they mammalian brain to cope with the frustration of sharing.
I hope my book will show in humorous way how a young child may feel and give us adults a better understanding.