You can file a partition suit in connection with the share held by your father in the property in question and such suit can be filed in a court within whose jurisiction the property is located.
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...
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Subletting of the premises in MHADA would depend on weather you are a tenant of MHADA or hold the premsies on ownership basis. If the premsies held on tenancy basis, then you will not be entitled to sublet the same without written consent of MHADA.
The repatriation of funds realised from sale of property in India to Canada would depend on the relevant provisions relating to regulation of foreign exchange and would also require permission from the Reserve Bank of India.
An oral will has to be proved before a court of competent jurisdiction and a probate of the same will have to be obtained before the bequest under the Will is given effect to.
All legal heirs of the grandfather will be entitled to their shares in the property depending on the religion you follow, the share of the elder son who has expired will devolve on his heirs.