The end?

If I am not mistaken .... he shoots his annoying mother, not himself.
By the way the SE dvd comes out very soon!

I personally think the little boy plugs his own mother at the end. Afterall, that horrible hag was beating the poor kid like a drum throughout the whole movie. He gives his abusive mom her rightful comeuppance at the end. It's the central point of the film: violence only begets violence; it's a cruel self-perpetuating chain that's passed down from one person to another. People who are victims of violence usually become victimizers at some point. At the film's end the little boy clearly kills his mom, thereby becoming yet another part of this seemingly endless cycle. I hope my reply clarifies any problems you had with the ending.

I got to go with boy shooting the mother. He finds a gun and decides to use it solve his problem and plugs his mother. You hear her yelling at him, you hear the gunshot, then nothing. The mother isn't screaming "You stupid kid, you just shot yourself" so I assume she was dead and he wasn't.

As for Candy surviving: you really don't know for sure. The gunshots will attrack police attention to area and they will look for the source of the gun and find the bodies. They will also notice the recent digging and investigate.

Candy's air supply isn't that good so she is probably in danger of dying if she doesn't get dug up soon. Will the police find her in time? We don't know...

He defiantly shot his mom.

Not sure why there's any speculation at all. His mother is calling and ringing the cowbell. The shot is heard, the mother stops calling, and you even hear the cowbell fall to the ground.