How to prove adoption.

8 months ago

Sir,
My Biological Grand father has 3 brother out of them their next Younger brother has adopted to My father in 1975 and also he have one girl child. But in 1980 the adaptive parent had died and all kind of rituals of funeral or else has been done by my father...... Then their real doughters marriage is did by my biological parent but all kind expenses and loans took for her marriage has be repaid by my father....Also in 2011 her children got married that time also my father spent money and after the marriage of her child she is now refusing that her father didn't adopted to my father and she registered property on her name.......So now how can we prove that my father has adopted by her father?? We don't have any documents but in rajasthan there is a one book called “RAV-BHATI BOOK" in this book all the historical events has been written by such Related Bhati and in this book there is note that my father has been adopted to his Uncle so how can we prove with the help of this book and also we have 50+ signatory so plz give some suggestions.