Unless one of you was there then there is NO actual knowledge of how the snake was kept, what it was kept in, the condition of the parents (sober or what) or if waking up at 10 was the norm.
Maybe he worked nights. Maybe he left the cage open. Maybe someone else left the cage open. Maybe it was a poorly built cage. Maybe the kid opened it.
Jumping to conclusions is very easy. Jumping to conclusions is also a good way to be wrong.
I'm sad the kid died, that's always tough.
Of course, for a twelve foot burm, which we have no confirmation of, to try to eat a 2 year old, well, that's a hungry snake which does go right down the road to improper care BUT, having kept a few burms, some are just hungry all the time at that size.
It sucks but facts are lacking. I'd sure like to know how the snake got out.