The innocence of the child mind, and their closeness to the afterlife(we all exist as spirits before were even born because the afterlife exists outside of time) via their closeness to their birth, allows small kids to see ghosts, and other higher dimensional entities that adults might not otherwise see. Most likely Grandma cant let go of her life, and feels she has unfinished business. Until she willingly passes through the light into the heavenly planes...
Xavier Remington
I'm the Founder, and President of Mystic Investigations. Big time paranormal investigator and hunter of evil supernatural entities.