Well... here's a long one from different points of view.
So, about the ghost in my grandma's basement, so this first happened to become a concern of mine when I saw it. My cousins were over, hanging out with me and my brother at my grandma's house. The one mainly in this story is Chris, the name is made-up, but "Chris" resembles the cousin who had most experienced this piece of the story, Chris is male. So anyway, we were bored so we decided to play Hide and Seek. Me and my cousin Chris(Chris was eight and I was ten at the time), hid in the basement. We hid in a large room that connected to the laundry room, and it was filled with storage. We hid there for a while, but we were unaware on whether everyone else knew we were downstairs hiding. Chris checked to see if anyone was down here looking for us. I stayed put. When he turned, he looked so freaked out. I asked what was wrong. He told me he saw a large blur of green zoom right past where we were. I panicked, and we both bolted upstairs. We told everyone what had happened and what Chris had seen. Then, we all went downstairs. We spent the rest of the time at grandma's house trying to see this ghost again, but the ghost didn't show up again. I haven't seen it since that day either. I am STILL terrified to go into the basement.
Now this part is from my aunt's experience, her made-up name for this story is Jennifer. Okay so my Aunt Jennifer was young at this time, I think my age, which is twelve. She fell down the stairs to the basement and hit her head on the yellow pole in the basement at the end of the staircase. But it was like someone had caught her or saved her, she blacked out still, but awoke unharmed, not a scratch or bruise. So we know by now that it was a good spirit(supposedly and convincingly). Another story from my Aunt Jennifer, was also when she was really young, probably about the same age. She had a friend spend the night and my Aunt Jennifer had closet-like door(s) in her room, now the Happy Room, which leads to the staircase to the basement, (it still does) and the kitchen. My Aunt Jennifer's friend was to sleep at the end of the bed, which was closest to the door(s) leading to the basement staircase. The friend claimed she was scared and uncomfortable and couldn't sleep, and so Aunt Jennifer switched spots with her. A while later, Aunt Jennifer couldn't sleep, but her friend was out cold. Shortly, Aunt Jennifer hears what sounds like heavy, fast running footsteps from downstairs. Which supports that the blur Chris saw, because the blur was big, as to be heavy, and it was going really fast, as the footsteps were.
So what did you think? It is a real story I have witnessed. Was it long enough???