1. Details provided by you is inadequate for proper advice, 2. Whose property it was? Was it your grandfather's property or your faher's property? 3. How has your father's brother converted the said property in his name? What document is he showing in support of his such conversion? 4. However, if you do not have any particular document to claim the said property or any share thereon, first conduct a search from the registry office to ascertain in whose name the property has been last registered & obtain a certified copy of the title deed which has been last registered, 5. If the title of the property registered is shown in your grandfather's or father's name, file a partition suit claiming your share, 6. If the title deed last registered is found to be in your Uncle's name, even then you file partition suit challenging the said Title Deed of your uncle on appropriate ground, 7. Engage a local lawyer for the purpose.