Is this not the most ridiculous parenting ever???

Yesterday, my newphew came over who is just three years old...i hadn't seen him in about 8 months and he seemed like such a nice kid...however, his mother is absolute trailer trash...my brother, who knocked her up 3 years ago has had problems all throughout his life...never graduated from high school, alcoholic, drugs, etc....you get the picture...apparently, this "mother" who lives with her sister and boyfriend, let him play Grand Theft Auto: San Andreas...they turn it on over at our house b/c i have the game and the kid starts freaking out, swearing every other word, yelling...and i mean hardcore swearing like "i'm going to take this baseball bat and kill this f***ing cop"...this kid now percieves that as reality and is going to grow up thinking that this behavior is okay....i was stunned...there are fourteen year olds who shouldn't be playing that game, let alone three year olds....i have no idea what to do b/c honestly, the kid doesn't stand a chance in life in those surroundings....and if you think talking to this "mother" will help, it's no use...in fact, she just had another kid and she's "pretty sure she knows who the father is"...perhaps the most ridiculous and sad situation i've seen and it's going on in my own family...any advice is strongly appreciated..thanks
chilli