Days before my elderly aunt died, she seemed to see my deceased mother and their mother hovering over the foot of her bed. She called to them by name. She said, "What are you doing here?" My aunt had not been told of my mother's recent death. It seems my aunt was well aware that her mother came from heaven to get her, and was not of the earthly realm as those relatives in the room. But, she was surprised that my mom came with grandma from heaven. She passed peacefully soon after.
As an aside, after my mother's passing. I saw her for a day or so afterward; it was very startling.
Knowing all three, my grandmother, mother and aunt, are in heaven gives me great joy.