I assume your grandfather was a Hindu by religion. Since your grandfather had died intestate i.e. without leaving a Will, all his children will have an equal share in his properties (Presuming your grand mother has passed away too). It is advisable to obtain a succession certificate from court for distribution of your grandfather’s properties.
To prevent anyone from wrongfully dealing in the flats or claiming sole ownership, you can write a letter to the society informing them about the names of legal heirs and requesting not to adhere to any transfer requests without written permission of all the legal heirs. If you still apprehend that other family members are trying to create third party rights in the flats then you can approach the court and get a restraining orders.
Presuming that you are a Hindu family, your grandfather's property will be distributed according to the provisions of the Hindu Succession Act, 1956. Under this law, the property of an intestate deceased goes first to Class I heirs in equal proportion. Class I heirs are (1) sons, (2) daughters, (3) widows, (4) mothers, (5) sons of a pre-deceased son, (6) widows of a pre-deceased son, (7) son of a pre-deceased sons of a predeceased son, and (8) widows of a pre-deceased son of a predeceased son. In your stated case, assuming your grandmother is not alive, there are 4 Class I heirs: the three sons and a daughter. The property will be divided equally among them.
If the concerned family members agree, they may enter into a Deed of Family Settlement or a Memorandum of Understanding, whereby some of them may give up their claim on their entitlement in exchange for some consideration.
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