A few of my ancestors have been known to pay visits to the living when they should be off presumably struming a harp somewhere.
My Mom swore that she saw a ghostly figure, at the foot of her bed, looking into the cradle where my newborn oldest sister was peacefully asleep in 1965.
Then there was 1972, the year my Paternal Granma died and decided it was the perfect time to immigrate to America.
There I was minding my own busines practicing my Violin in my bedroom one evening...
Mom was in the kitchen.
Dad, well Dad was ensconced in a Mental Hospital (A long story.)
There were three loud knocks at the front door.
Naturally I took advantage of the interruption to beat my mom to the door. Only there was no one there. We checked the yard, and the street, but both were empty.
Three days later it happened again. This time we walked up and down the street and knocked on neighbors doors to see if they saw anything unusual.
A week later we get a letter from Yugoslavia from my Grandfather, addressed to my Father.
Luckily Dad was well enough to read the letter so he translated the contents upon our next visit.
It was sad news. His Mother, whom he'd not seen, in person, since the mid- 1940's, had passed away.
He took it hard.
The odd part was revealed when we learned the dates of her death and burial.
Yes, you guessed it! She died the day of the first knocks, and was buried three days later on the day of the 2nd knocks. :-D
Then there's the story of a group of the family, sometime in the 40's, sitting together after someones funeral, when a flame appeared under their chairs.
The flame went from person to person before stopping under a chair. Turns out this person was the next to kick the bucket.
The person who told me that story is long dead and though I don't remember who the members of the group were, they too are all long gone.
Everyone doing genealogy and family history will know of, or discover, ghost stories such as these, some decades, or centuries old. ;-D