1) unlike Hindu law, there is no provision for any ancestral or joint family property. Accordingly, under Muslim law of inheritance, no distinction has been made between selfacquired and ancestral property. All properties, whether acquired by a Muslim himself or inherited by his ancestors, are regarded as an individual property and, may be inherited by his legal heirs.
2)is the grand father mentally sound?
3) if gift deed has been executed on account of fruad or coercion grandson can challenge the gift made by grandfather .
4)grand son can move court for setting aside gift deed and court may grant injunction restraining creation of third party rights pending hearing and final disposal of suit