We have undivided ancestral property at Chennai, state of Tamil Nadu. The property still in my grandfather name (mother's father), he died in1984 & grandmother 2003 and my mother passed away on 2010. My mother's siblings are one brother and other three sisters (one elder sister and brother passed on 2005 & 2007 respectively). Now what is the procedure to claim the property legally and with whom this proceedings to be started and how.