The person who grabbed for the stone was Jon's mom.
She looked at it. "How did this get in here?" She put it back on the nightstand and got out of bed. She figured it was something from her children that she grabbed from downstairs and put there before she went to sleep the previous night. She was really tired at the time, so that's probably why she couldn't remember doing it.
Idly, she noticed how much the stone looked like the stone her dad (Jon's grandfather) had called a wishing stone when she was a kid. Of course she no longer believed in such things when she got older. "I wonder what it would be like if you were real?" she said to the stone. "If I could just say, I wish...."