It is believed that deceased owner was Hindu and property was self acquired.
The matter shall be decided as per Hindu Succession laws.
If the deceased died without leaving any WILL then the ClassI legal heir shall share the property equally amongst themselves……………………Classi legal heir are:
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Son/Daughter
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Widow
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Mother
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Son/Daughter of a pre-deceased son (per-deceased means “already Dead”)
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Son/Daughter of a pre-deceased Daughter
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Widow of a pre-deceased son
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Son/Daughter of a pre-deceased son of a pre-deceased son (3 levels)
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Widow of a pre-deceased son of a predeceased son
If your father was the only child of his parents then self acquired property of your grandfather shall be shared equally by your father and his mother (your grandmother)……………………………..
Since mother of your father is also deceased and she acquired the share in property from her husband (and if she has not left any WILL for her share) her share shall be further divided ……………..as per Hindu Succession Laws i.e……………………..
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If the women has acquired any property from her Husband, in that case the first right will be of the heirs of her husband , in case of absence of his sons or daughters
Hence you can assess how the share in property shall pass to whom and in which ratio……………………
As far as some document that has been signed by your father to give his share to you , you may show it to local lawyer dealing in such/revenue matters……………………