Grandma passed away 20 years ago. According to Chinese tradition, her family waited at home for 7 days in case her spirit returned to see them one last time. That night, they heard footsteps entering the home without seeing anyone, then walking into grandma's bedroom before the door closed again. The next day, grandma's glass that had been in her bedroom was missing, though no one had gone in. The family believes grandma's spirit returned and took the glass, solving the mystery.