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I know of two cases.

The first being where two boys are convicted of killing their own father. [ x ]

The second of another young boy convicted of killing another much younger boy. [ x ]

Now that I think about it, there is a similar case where a young girl was convicted of murdering her toddler neighbor. [ x ]

I don't remember the names of these, but I will do my research and will edit this post with the appropriate links. 3nodding

Is there any age range you would prefer?

EDITED:

Added the links to the cases. (: And here's a few more cases, in case you're interested.

[ x ] [ x ] [ x ]

The Sasebo Slashing

Had a neighbor when I grew up that had served 15 years for killing his girlfriend at the time and the guy she was humping behind his back with a chainsaw.

He was nice, very helpful towards the others in the street and often invited everybody over in the summers and spring seasons for yard parties.
Ended up getting married and got kids before he moved.