Absolutely! Ghosts and angels both. the ghosts can be good, bad or ornery. I'm sure my daughter had one in the house she just moved from. She saw shadows several times and the kids didn't want to sleep in their own beds. The other daughter had a ghost cat. They saw it batting the curtains frequently in just 1 room.
My husband was visited by his family during the week before he died. He had always said they visited frequently.