My highly intelligent, sweet, adorable 4 year old granddaughter INSISTS she had a sister who died. Her name was Barbara. She didn't. She is an only child. But she INSISTS it to the point of crying and getting upset if you tell her she didn't and that she shouldn't tell that story. I remember when my daughter was in the 4 to 5 year age group she had pulled a hang nail on her finger. It got infected. I took her to the doctor. When the doctor asked her what happened she declared, "I got runned over by a car." Sure, the policeman could have asked, but I'm not sure that anything a four year old says could be reliable. A four year old could repeat anything she was told to say - or a four year old with a very vivid imagination could say anything out of the blue. Had the child said, "I saw daddy hit mommy this morning," would that have good enough evidence for you, or could the other side of that be that some of these meddlesome, gossipy, swinging neighbors told her to say that?