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Consult with an attorney as soon as possible. This matter is a probate and landlord/tenant issue. He may have the right to collect rent depending on the situation. Whoever is the rightful owner of the property has the right to collect. The rightful owner, as of right now, is the biggest question you need answered from an experienced attorney.
If you intend to file bankruptcy, the court will be looking at all of your assets. If you "need" a vehicle, you can absolutely purchase a vehicle. However, it would be best to consult with an attorney before you make such a purchase to discuss the specifics of the value and expense of the vehicle, along with a discussion of all of your other assets.
I am assuming the home is upside down and a short sale would be required. If that is the case, it must be an arms length transaction, meaning immediate family such as yourself cannot purchase the property. Unless, however, the lender is aware that you are purchasing the property and has no problem.
As to maintenance fees in paritcular, post-petition debt you will be liable for; however, pre-petition debt you are not. Therefore I recommend you request an itemization of unpaid maintenance fees so you can ensure that the fees being sought are correct. Attempt to do a settlement on the outstanding fees owed post-petition. You may also want to complete a short sale or a deed in lieu of foreclosure to get the property out of your name.