1) you mean to say your grand uncle executed gift deed in favour of your grand father through registered document

2) once gift deed is executed duly stamped and registered your uncle has no share in property

your uncle has no share in said property.

If your grandfather transferred the title through a deed of transfer to your father then it became your father's separate property, to which his legal heirs alone succeeded on his intestate demise. This being said, without perusal of the documents it is not possible to speak with exactitude. So consult a lawyer with the complete set of documents.

Now the claim on this land is being made by son of my Grand fathers brother. Is the claim made by them valid when all the documents show my fathers and grandfathers name.

The reported transfer deed should be a registered document.

The property should have been taken possession and properly mutated.

In what way is he claiming title?

Let him approach court, where you can put forth your side arguments to prove that his claim is not maintainable.

It is thru a transfer deed which is registered with the govt office . A copy of deed is available which clearly mentions that the property has been given to my Grandfather.

Under this circumstance the claim made the opposite party is without any rhyme or reason and is not maintainable in law.