My Dad Won't Sell His House That I Am Cosigned On And Is Behind On Mortgage Payments

Over the last 3 years, my dad has developed a substance abuse problem and has managed to lose everything in his life (except for our house). The mortgage is under both of our names, and we are behind payments. I've been asking him to put the house up for sale as we can no longer afford to make the payments and he always comes up with excuses. My credit score has already dropped substantially due to a personal loan that I co signed for him (stupid, I know), the thing is I've trusted my dad my entire life until the last few years. If I could make the payments, I would the thing is that I'm a 26 year old unemployed full time student and have like no money to my name. The reason I'm even under the mortgage is because I was working a really good job when I was 21 and when my dad refinanced the house he asked me if I'd cosign for him since I was eligible, and I did. I just really don't know what my options are or what to do, he has zero dollars to his name and is still coming up with excuses. I don't want us to lose the house to the bank, would rather put the house up for sale as it is and make however much money we can. Is there any way I can sell "a portion" of the house just to get my name off the loan and clear out some debt?