My Grandmother Was My Grandma, but I Don't Think She Was Her

My grandfather moved out and my aunt took over the house with her wife. Recently, we've all been seeing figures and shadows swoosh past doorways. A small child of a family friend went to use the bathroom and saw what he described to be some one standing at that doorway to the longry room,. My aunt's wife said she saw it too, but i don't think it was my grandmother this time. I must also inform you that the owner of the house had a son who passed away due to a four wheeler accident. He didn't die in the house itself, but that upstairs bedroom was his, and still to this day has some of his belongings, including four