Yep, this is strange enough, but what really astounds me is that the parents didn't wake Burke up immediately after finding the RN. His bedroom was on the 2nd floor, as JB's was...he might have heard or seen something during the night.
Instead, the Ramseys decide to let him sleep in. I find this incredible. If your daughter was missing, and her brother (almost 10 years old) was right down the hall from her bedroom, wouldn't you wake that child up and question him right away? Burke, did you hear any strange voices, a door slam, footsteps, did you see or hear JB during the night, anything!
The Ramseys didn't forget to wake Burke; by their own admission, they chose not to wake him. How many of you parents would do that?