This is the reason men will kill men over a women, relatives, cuz or bro, it don't matter. The power of the pussy will divide the world.
First of all, for you to even consider getting with her is fawked up. Because of your consideration, I don't think you will have many friends. If you do have friends, close cuz, even brothers, you will eventually fawked them over for pussy. They gonna curse your azz to hell if you do and your life will be probably not worth living bc you will encounter many hardship along the way due to all the curse in the world, bc you fawked yourself over.
The good thing is you could get shot and that is probably the best way to go out for fawking your cuz/bro over some worthless pussy. Then again, if you chose to find a way to fawk her, than you already choosen death, if it comes. Good luck.