Jon was in his room with his rock, when it occurred to him. Why didn't his grandfather give the stone to his mother? She was an adult and she'd naturally be the one to inherit it, right?
"I wish I knew why I got this stone instead of Mom."
Suddenly new knowledge entered Jon's mind. His mother had, many years ago before Jon was even born, been lent the stone for a month--and during that period of time, had messed up the wishes. Jon's grandfather, knowing what had happened, had decided that when it came time for someone to get the stone permanently, it would be someone else who might not make so many mistakes. Jon.
But could it be really true? That his mother....