I too think it depends on the kids. My parents didn't let me stay alone, and look after my brother, until I was like 12, I think. And then for only a few hours. At 15, I was staying home all day in the summer while my parents worked, but not until I was 17 did I stay home alone all night, again with my brother who is 5 years younger. It might have all been done sooner had it been needed, as we were both pretty responsible at an early age. With all this said though, my parents were old fashioned. My sister is 9, and very smart and responsible, and she's only stayed by herself for an hour at the longest. I guess my mom is still old fashioned.
But in this case, a nine year old caring for a younger child with special needs is just wrong. And not answering the cell phone when called (I'm assuming the cops called from the house, but even if it was the police department, wouldn't that say to you that there was something wrong?) is just scary. I definitely don't think these parents, as Bill O'Rights said, have their priorities straight.
