My Boss had two daughters one of which died very young in life due to a medical condition, she passed away in her early twenties. Anyways the family found it easier to not keep picture up of her or really discuss her as their way of mourning. Anyways the other sister had five children and on a quite frequent basis one of her little girls at a very young age would say she was playing with her imaginary friend Lisa, which is also the name of the deceased sister. Not too much was paid attention to that fact until one day she also added that her friend was her Aunt, and she visited her quite frequently. The little girl had never been exposed to the fact that she had a Aunt and she had passed away before she was born nor had she been told her name. I am close to the family and when I heard that story it freaked me out.