The only way to remove him from title is to refinance the home. You should certainly list him as both a codebtor and creditor in your bankruptcy. If he has any objections to your bankruptcy filing, exemptions, or Chapter 13 Plan, he has a very limited period of time in which to assert them.
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You cannot remove his interest in the property via BK, but, as pointed out by others, a refinance might remove him from the loan. If he is "on title" even with a refinance, he will have to "quitclaim" any interest in the property. If he is unwilling to cooperate, you will need a lawyer to assist you in filing a "quiet title" action and get a court order that he has no interest in the property. Good luck.
You are not my client and I am not your attorney. This advice is given in the spirit of the AVVO platform and is based on general legal principles. You become a client when you enter into a formal retainer agreement with me.
First, you might indicate that you are in a ch 7 in fact if that is true. Second, in bankruptcy...there are assets and liabilities to begin with. So, you should list the asset as you hopefully already did in your case and list him as a co-debtor. Technically, it is possibly someone did not have any interest in a house at the time of filing a bankruptcy and later having an interest (if they moved onto the property and helped make payments after they filed bankruptcy just like an unmarried "partner" would have such an interest); however, assuming he has no legal claim to the asset, you would own it 100% and state you are the sole person on title. As far as liability, his debt was discharged by his ch 7 assuming he received a discharge. With respect to a "loan modification" he says he did not sign, I don't see where in fact any facts are listed stating his name was on a modification. If it was not, he can go to the police and anyone else in the world, but if you did nothing wrong, don't worry about him. If you are somehow mistaken in the facts and want to do another loan modification, because you are in bankruptcy, if you have any other problems, your attorney could bring a declaratory action adversary lawsuit in court for the court to enter an order to declare I suppose that he has no interest in the real estate and that he is not part of the loan (that you obtained last year). Other than that, I don't see any other issues based on the facts as laid out. If somehow the facts are different after reading this answer, you can amend or add to your facts so that an attorney reading this later can provide cleared advice or change the advice being provided. If you are in a chapter 13, he should have filed a proof of claim or will be the deadline date and you can object to a claim if there is a proper basis for objection and the court will rule on that objection. Good luck and I hope my advice assists you.