Daughter in law trying to acquire land of given to daughter by parents

The case is filed before the court of SDM. That the respondent is a daughter (unmarried age-37 yrs)and only sibling of a tribal mother and brahmin father. both mother and father are not alive.A property of tribal land is owned for the mother by her father, registered on 1980. now the question has been raised by the daughter in law of one of the sibling of the first owner,since the respondent is a daughter of a Brahmin father, and so the respondent has deceptively acquired the piece of land. Father of the respondent died of tuberculosis after suffering for a long time,mother also suffered with paralysis for more than 20 years and died of cardiac attack. This is the only property that has been left by the illiterate and innocent parents of the respondent, she also doesn't have any source of income,the only property on which she is fully depending for her livelihood. The petitioner was an employee of coal India limited,just retired an has plenty of acres of land as well,many of them were