Indian Christian leaves behind property in Kerala and Mumbai without will , how to claim ownership ?

My father- an indian Christian who was employed in Private sector and residing at Mumbai died last year July without leaving a will and is survived by his wife and two married daughers. He has residential property in his name in Mumbai and in Kerala - both flat and plot. We wish to sell some of the plots in Mumbai and Kerala . and we want to know 1) Which certificate we should obtain - Succession Cert / Legal Heir Cert / LOA 2) For the residential flats in Mumbai and kerala in Co-op Hsg Society the share cert will be transferred to wife name, is any other procedure still required it the flat needs to be sold after some years. There is no dispute between us - wife and two daughers reg the property distribution and just want to ensure that some property is sold so that the wife can comfortably lead her life with sales proceeds and also follow the due process of law relating to transfer of immovable property. Conflicting advise reg the certificate to be applied for from various lawyers on the same subject has left us confused. Some say we need to take Legal Heir cert fm Tehsildar office others say it should be legal heir cert from Mumbai High court and others say that it should be LOA. There is only immovable property that needs to be transferred as bank accounts were in joint name and no insurance claim in pending . PLS ADVISE