Live person decleared as dead for property

Dear Sir my grandmother was having land in Karnataka after her death it divide between my father & Uncle. my father done my younger brother marriage before me after three he suicided he was having a son after two years I married my younger brother widow against my parent wish then after five year my father divided land equally before his death (2006 died) in three part one to my elder sister one to my younger sister & third part to my step son. In Dec 2009 my mother is died. then I went to Karnataka to search on what basis my father divided land there I found the signature done on application to Tahsildar is false & in Genealogy there no name of my younger brother and my name is mentioned as dead at the age of 28. I am now 44 year old & alive. document submitted to Tahsildar there is four signature of my father but all are different mode & style it is not matching original signature. My both sister is not willing to give me single rupee from ancienter property. Kindly help what legal action can be taken against both sister under which article. list of documents required to file a case?