I suggest you contact an attorney to determine what exactly must be done and what legal options you have. The options may depend on your mother's estate plan, if any, and the local rules regarding transfer of property in this kind of situation. Unfortunately, real estate rules can be tricky sometimes because we value the ownership of property so much as a society.
In the meantime, feel free to browse through the free information in LawInfo's Legal Resource Center:
http://www.lawinfo.com/index.cfm/fus...lient.consumer, or search for your particular topic here:
http://resources.lawinfo.com/index.html.