google child abuse
i don't think he'll get the results he's looking for if he googles that...
anyways, i really don't mean to insult your mother or anything and i'm sorry if this is offensive to you, but she's a loving terrible person. she's forcing you to "choose" who you love more and is putting stress on you for no reason whatsoever, and to add insult to injury she's also intentionally hurting you emotionally.
also drendran, forget you and your stuff. this is not something "he can just get over". your whole world is pretty much torn apart if you're 12 and you have a parent that is supposed to love and protect you but instead hurts you emotionally for no reason. what is he supposed to do now? who is he supposed to go to other than his dad(i think, at least), if he can't even trust his own mother anymore?