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I think it is not possible to answer the question as is, but this document from the Indian courts lays out the relevant legal variables. A major split is between Sharers and Residuaries: a Sharers are all related by blood. A secondary split relates to testate vs. intestate succession (was there a will?). There are also special rules for West Bengal, Chennai ...
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The scholars may be correct.
The husband died first, so his widow and daughter inherit their % share from his estate. The father-in-law then died, and unless she is a beneficiary in his wasiyat, the widow is not one of his heirs so she is not eligible to inherit.
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