Father who has not distributed property among his children has expired. His eldest son has
also recently expired. Do the sons and daughters of the expired son have a right on the
grandfather's property ? Grand mother is very much alive. What is the legal remedy ?
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Here it has not been clarified that the problem relates to HINDU or Muslim.
Assuming that the problem relates to Hindu -- yes, the sons and daughters of the expired son have very much right on the expired grandfather's property and they will take the portion and share of their father jointly as tenants in common; they can file a suit for declaration, injunction with prayer of partition before the competent civil court of jurisdiction.
In Muslims - further it has not been clarified the persons belongs to either 'Sunni' or SIYA's. However, the grand mother being the sharer shall receive first as sharer and the remaining property, after the share of sharers, will be distributed as per rule of inheritance of Mohammedan Law.