. >> carthen's cellmate, isaiah thompson, has also been validated as a member of the zillas gang.s charged with possession of marijuana, possession of a firearm by a felon, resisting a police officer. he has pled not guilty. thompson grew up with carthen in oak park. the two men are cousins but consider themselves brothers. >> am brother's real serious. and he's a thinker, know what i'm saying? he's analytical. so the dude ain't to be [ bleep ] with. >> thompson declined to share much personal information. preferring to express himself through rap instead. ♪ they label me a gang's lead sore y'all can get the message ♪ ♪ pow money who want it let's get it ♪ >> they say rap was passed to them by their founders. >> we come from the black founding family in oak park. they was like, you ain't playing basketball and shooting the hoop, you off in the rap. dance and entertain. you off in the rap. ♪ i weathered every storm embrace it when it come ♪ ♪ my dog's in the pound they want to lay us down with the tags still on us ♪ ♪ and life is the price that they try and give for us ♪ >> carthen