Abusive relationship - Mother/Older brother Co-dependency?

My older brother takes advantage of my mother whenever he needs something pretty much. He's not physically abusive or anything like that I would put an end to that QUICK if that was the case. Well its been an ongoing thing that he refuses to pay my mom ANYTHING to help out literally ANYTHING no money no NOTHING but he still expects us to do everything for him the other night I had to drive him and his friend somewhere because neither me or my mother lets him drive our cars anymore. He actually killed my car and then refused to pay for it to be repaired because I told him he couldn't drive it anymore saying "why am I gonna pay for it to be fixed if I'm not gonna be able to drive it after". Well on the way there I noticed he was wearing one of my good hats my favorite hat actually so I was like 0_o and took it right off his head apparently he went in my room and took it without asking. That's not even the worst part. Later in the day me and my mom went grocery shopping and he I guess went right into my room again, grabbed it out of the basket I put it in and put it in his room. On my way to my room I looked in his and saw it. I took it back and when he got home I confronted him about it I said "Did you go in my room and get this hat?" he just looked at me and laughed but didn't say anything he just stared at me with a look on his face like he didn't know what to say. So I asked again "Did you go in my room and get my hat?" he goes "yea" so I say "okay why" he goes "so I can wear it". About a month ago I unhooked his computer from the internet because as stated he refused to pay rent or anything. Keep in mind my mom was only asking him to give her $100 a week which may seem a lot but he works construction taking home $490 a week, also my mom does everything, the laundry, she cooks, she does the dishes, etc. Well today after work he comes storming in the house n goes "I want my ******* computer turned back on!" so I was like I said "I'm not hooking it back up until you give mom money for it". So he went in his room and got 30 bucks, gives it to her then walks back so he can see into my room and look at me sitting at my computer and says to me "I gave her money now turn my ******* computer back on!". So needless to say he STILL has no internet lol. He started arguing with my mom about him not contributing to anything in the house. As soon as I heard them start I stood up and went into the living room and got into it. Soon as he saw me comin he was like "Go sit back down I'm not even talking to you right now" so I stayed, **** em. Anyway my mom brought up the fact that he can spend $85 on a bucket of paint to paint the walls in the basement because he had it in his head (before talking to anyone about it too mind you) that my grandmother would keep the house in her name and let him pay her every month. He can't even pay my mom $100 a week because he "doesn't cost anything to live here". My brother is a huuuuuuuuge problem in this house and I've tried an tried I can't stress how much I try to tell her to say no to him, but she always gives in and gives him whatever he wants. Tonight after the argument she brought him in her truck (that's leaking gas from a hole in the rotted frame f.y.i. but as you can imagine not until he put that big jug of paint in the back hmmmmmm) to get Chinese food. I don't know whether it's to avoid drama or what but it's literally draining the life out of her. One day he texted me while he was at work simply saying "I want my computer turned back on for when I get home". No "please", no "I'll give mom money", just "turn it on for when I get home". When I told him I wouldn't do it he got all mad and said "**** you both then" (meaning me and my mother). So I put his bed on the front porch and texted him "your bed is on the porch you better move it before it rains again". Well he then proceeded to call my moms cell phone 18 yes that's right EIGHTEEN times while she was at work. He left her a voicemail saying "you better get home and talk to your son" and "he's lucky I have patience or I would've beat the **** out of him by now" (yea that's why when he got home from work he didn't "beat me up") Well anyway, I don't know if she didn't see it or she just let him do this he brought his mattress back up into his room. She didn't tell me until the mattress was in position back in his room though so that was kind of sketchy. I'm getting to the end of my rope here, and as you can probably tell because I'm not typing this from prison right now lol my rope is pretty damn long. I would put his **** out again but then I think my mom would help him bring it all back in when he got to her. I'm doing my best here to help her see but it seems she just won't listen! I tried to get her to read a co-dependency website with a description of it and many many links on how to treat it and stuff. She just said "what made you come to this site" I said "that's you and kyle", she just goes "yea I know" and clicks off