Can I refinance my house even if I have a bad credit?

Here's the case: I've lived in this house for quite a long time now, and already built at least $400K equity. I still owe around $150K. Here's my concern: I refi my house last year and cash out $20K. My lender told me I need a co-signer in order to approved the loan. I let my brother and his wife to... show more Here's the case: I've lived in this house for quite a long time now, and already built at least $400K equity. I still owe around $150K. Here's my concern: I refi my house last year and cash out $20K. My lender told me I need a co-signer in order to approved the loan.
I let my brother and his wife to co-sign, so they checked their credit and the loan approved. My biggest concerned was I only became a co-owner of my own house and they were became the primary borrower. Legally, they can do whatever in this house and it's not I don't trust them but let say something bad happened, like if my brother died or they filed divorce. Legally, my sister-in-law can get something out of this house, if I'm not mistaken. My only hope to get rid of their names is to refinance my house to my own name, but since I have a bad credit, can some lender approve it?
Please I need a good advice on how to refinance my house and by transferring the title in my own name.
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