This is not my story, but my great grandmother's. She is now 98 years old and asked if I could share it for her.
My great grandmother has 9 children, 8 of who are still living today. Her oldest child died at the age of 4, when he fell into a canal. She and her husband were devastated, and spent a long time recovering. They filled the gap in their lives with 8 more children, 3 girls and 5 boys.
55 years later, her husband passed away of old age. (This was all before I was born.) She was, naturally, heartbroken, and it was even harder to cope as now all of her children had moved out and she was now by herself. Her oldest daughter came to live with her and help her through her hard times.
One night, when her daughter had gone to the grocery store, my grandmother was sitting in her favorite chair watching Wheel of Fortune (amazing how she still remembers these things). She was having a really hard time dealing with her loss and was trying to distract herself. Then, right in front of her she saw her late husband appear, and he was holding hands with a small boy... Their son who had died. They were smiling and they waved at her. They didn't say anything, and soon disappeared, smiling as they went. My grandmother knew that they were watching over her, and knew her husband belonged up in heaven with their son now.
After her encounter, she never saw them again, but knows they are happy together, and that in turn makes her happy knowing they are waiting for her to join them.
To this day she talks about how excited she is to go see them again. I myself have only seen one ghost before (and that's a different story), but I know that by the way my great grandmother describes her experience, how teary eyed she gets, that she really did see them and she is so happy knowing that they are together.