Unless the Will is probated no rights flow from the same and as such unless you or your father have applied for probate of such Will, you would not be entitled to any benefits under the Will executed by the elder brother of your father. However, even if the Will is not probated, you would still have a share in the property in view of your father being one of the legal heirs of his elder brother...
(View more)
All children of your Ganrd father would have equal share in his estate. On death of any of the children and if there are no heirs of such children, then his /her share in the property would also devolve on his/her remaining brothers and sisters and/or their respective heirs.
If the property of your grandfather was his self acquired property then you would have no right to challenge the trasnfer of the property by your grandfather to one of his daughters only, however, if the property is ancestral property them you would be entitled to file a suit challenging the transfer and seeking your share in such property.