My mother passed away at home.
Her ghost appeared regularly. My dad thought he was seeing things until his dog would chase the ghost around the house. The dog saw or sensed it’s presence.
My next door neighbor who watched me grow up passed about 10 years ago and is still around. During the day he hangs out in his shop where he sat for years and years watching his garden grow drinking beer. I go have a beer with him now and then. It took the new owner a couple years to get used to him being around all the time. He goes back and forth down the hall in the house about four times a night.