Look the M rating means MATURE
Titles rated M (Mature) have content that may be suitable for persons ages 17 and older. Titles in this category may contain intense violence, blood and gore, and se......content and/or strong language.
my nephew plays it and he's 11... honestly, it's got alot of violence, some inappropriate language, and suggestive sexual themes. none of it (except for the violence) is really over-the-top.... but really, that's all entirely up to your parents. i always get the AC games for my nephew for christmas, so by that point, i can preview the game before hand with my copy. in defense of this decision, i wouldn't buy the games for him if his parents said not to. anyway, if your mother is willing to give it a chance, she should research it herself rather than sending you to do it for her (though that helps as well).