With permission I am telling these tales of my grandfather (my mom's dad) seeing ghosts.
He was 16 years old at the time this one happened.
He was sent to the basement to get something, and while he stood at the bottom of the stairs searching the shelf full of jars for the one he wanted he felt someone watching him from behind. He turned to find himself face to face with his mom who had died when he was 12.
He dropped the jars he was holding in his hands and ran back upstairs and refused to go back in the basement alone.
He says he now wishes he had not run away from her but stayed to see what she wanted. He's never seen her since and wonders what she wanted.
This wasn't the last time he was to see a ghost.
When he was a young man doing baptisms for the dead (my mom's dads side of the family are LDS and my grandma converted to marry in the temple) at the Salt Lake Temple. At the time this happened they used little business card sized name cards with the information of the deceased being baptized.
My grandpa was part of a group doing baptisms and he could see a group of men sitting in the back row of the room they were in. One by one as the baptisms were done a man would get up and leave. Finally there was only one man left. The Baptism people began to pack things up as if they were done. Grandpa asked them why they didn't do the last man and they said there were no more to be done but grandpa insisted they look again.
The man went through the cards one last time and discovered two of them had stuck together. The baptism was performed and the man in the back row smiled at my grandpa and left.