Can a family claim residence rights after multiple generations of occu

Is there a legal provision that supports a family's right to residence after multiple generations of occupancy? In 1947, my maternal great-grandfather, his mother, and my grandfather, who had fled from Pakistan due to the war and became refugees, were allocated a space in Delhi to rebuild their lives. They were left stranded and had to leave behind their ancestral properties in Pakistan. The property in question was acquired through possession, not ownership, by a landlord, who allowed my family to occupy the space at a very nominal rent as a gesture of goodwill. After the landlord's death, his heir is now seeking to claim ownership and has initiated legal action against the long-standing residents. Recently, my family lost the case in the district court, and I seek guidance on the appropriate appeal to file in the High Court, as well as strategies that could lead to a favorable outcome.