Sir i want to know the precautionary steps from fraud from my brother

I am 44 year female. My mother and father both passed away without writing any will. We are two sister and one brother. My brother is refusing to share any detail of the property and bank account with us. He is also planning to present a fake unregistered will. We live very far away and if he presents unregistered fake will we would not be able to know. Sir please tell the precautionary steps that we sisters should take before he presents the fake will and how can we get to know the actual assets of our parents as our brother is not telling.