My daughter called me not long ago asking how to handle a friend's son, same age and single mom. The picking on her she could take, but he harassed her pets, tried to strangle the cat and poke the dog. When stopped from that he threw things around the house at the cat and screamed in the dog's face. When she put the cat outside and the dog in its cage, in fear that it might actually bite him, he screamed into the cage at the dog, poking it with things (and now the dog goes insane at the first sight of him and has to be caged). She said the child seemed to have some really deep problems but he'd been taken in for evaluation time and time again and all of his issues were behavioral (mom doesn't believe in any type of discipline whatsoever). I told her if she couldn't discipline him herself and mom wouldn't, his behavior was totally unacceptable, then her only recourse was to avoid him completely. I also told her she should just be honest with his mom about it, say it with love but tell her all the same.
Last I heard, my daughter was on her cell with me, whispering and doing a belly crawl from her living room to her bedroom while this young woman was knocking at her door, child in tow.
Do not store up for yourselves treasures on earth, where moth and rust destroy, and where thieves break in and steal. 20 But store up for yourselves treasures in heaven, where moth and rust do not destroy, and where thieves do not break in and steal. 21 For where your treasure is, there your heart will be also. ~ Matthew 6:19-21 ~