Fraudulent Transfer of property

My Mother has 3 siblings. So in all they are two brothers and 2 sisters. My Mothers mother (my grandmother) expired on 7th of June. She was living in a house in Golibar, Santacruz east along with my mothers elder brother, his wife and two sons. The house is in my grandmothers name. After my grandmother expired in December, my mothers elder brother was threatening my mother to sign a “No-Objection Certificate” so he can transfer that house in his name. He works in Kuwait and has been constantly threatening and harassing my mother to sign the no-objection certificate. In addition to this, a few days ago, my mother went to ask for Grandmothers death certificate and they had refused to give the same. My mother fears that her elder brother will fraudulently transfer the house in his name by forging signatures etc. and she has been fed up with the threats and harassment. That’s why we need to take legal action for the same. Either stay order for not selling the house or something like that.