Right in property

Normally, nominee can be appointed only to receive the money of a bank depositor who has died. The nominee can only withdraw the amount. However, nominee cannot claim to be the absolute owner of the same. As for as the properties concerned, the succession will open to all the legal heirs according to their personal law.

I am living in my ancestral house ( Mother's Father's property ) belonging to my maternal grandfather. All other family members are citizens of USA & UK. Since there is no amicable settlement coming forth for the last 20 years, How do I stake a claim for the property. Since dual citizenship no more exists, can they stake a claim or contest my claim in court.  Please let me know the relevent sections of the property Act  by which I can stake a claim on the same.