Where did the scream come from?

I heard that a neighbor said there was a child's scream during the night of the 25th-26th. Where was the scream coming from (upper or lower floors)? Did ANYONE besides this neighbor - who I assume was across the street at the very least - hear the scream? What time was it? Did she later retract her statement about hearing the scream?

Did the people in the home - John, Patsy, and Burke- did they not hear this scream? Is that even possible?