Does adopted guy without legally , with family accepentence does he have a right on property

Hi I'm jayanth , sir my dad as been adopted without legally with family accepentence , but adopted person's first wife couldn't have children so they adopted my dad , where he is a son of adopted person's brother .and later first wife expired due to I'll health and the adopted person married again a lady wr she got 3 children's and after an years . In 3 children's the 2 children's expired wr they at matured and they passed due to I'll health and another one is alive and she ad been married , but the real matter goes on the second wife of adopted person is made a gift deed agreement of property in her name and she is telling get out of my house and I'll not give u any money or property and adopted person is also blackmailed by second wife that u should not give any property rights to him , but my dad's in all govt approved documents like adhar marks cards in all that the adopted person name is mentioned as father and second wife is telling to change name and vacate from the property and she is telling u doesn't have rights , so I'm asking here is my dad as a right here how can we move here next ..