Transfer of private limited company shares

Hello, I have question regarding transfer of shares of a PVT LTD company registered in Punjab. My father was a director of a PVT LTD company with 56% shares in the company.j After my fathers demise there is only 1 more director in the company who is my cousin. He doesn't hold much shares though (maybe 2%). Can somebody please suggest the legal process for the transfer of my fathers shares on my mothers and my siblings name? What all documents are required for the process? I will really appreciate if you can help.