Eldest sister captured all property documents forecefully

Dont worry.  In India everything can be challenged in court, provided you have time, money and patience.  You have not let know the finer aspects of the case.  However it is advisable to discuss this matter in private with a advocate locally than thinking of saving money and letting the whole world know about this by discussing on a public platform like this one.

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Member has deleted the query and a/c.

So NO reply.