How to leave a ** relationship

I have been with the same guy for 10 years. He has not once purposed and when i ask about it he gives some stupid excuse. Now We 2 kids together. I used to work but got overwhelmed with coming home to cook, clean, taking care of the kids, and the bills. His brother and sister live with us they dont work or go to school. They dont clean up or do anything. Their mom pays half the bills and rent but no food or essentials for the house. We argue all the time when we are not there they take stuff without asking and steal from us. And when i get mad i am the bad guy? I am just tired of taking care of him i want someone to take care of me. And yes i have told him plenty of times how i feel and nothing changes or get better i feel like it gets worse cause i am over all of this. And want to be done trying. But we have 2 kids and i don't know where to go from here or how to leave?

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