False claims on money given to me and my dad

Hi , in 2018 we purchased a land worth 28 lakhs(but registration was done for 5 lakhs as per government rate). 5 lakhs was transferred to selling person through online. In that 28 lakhs, my amount was 14 lakhs and my wife's mother gave 14 lakhs. I withdrew 5 lakhs from bank and gave it to my mother in-law(wife's mother)and transferred rest 4 lakhs to brother inlaw (wife's brother) though online. So the amount of 23 lakhs was kept at with my wife's mother house. On the date of purchase we went to her home and collected the 23 lakkhs from my wife's mother house(they took video while myother in law was handing money to me and father) , we paid it to selling person and registered the land. Recently we had a dispute between my wife and me in august 2021 and she went to her mom's house and demanded to register land on her name Otherwise she will not come to my home. After discussion for 4 months I registered 100 yards in her name and she came home in jan 2022. Now my wife and her mother are blackmailing me and my family to give the 19 lakhs with intrest that they gave to me on feb 13 2018. I am not sure what to do in this case , they are blackmailing my family that they will attach my house in the court and remove us from my house. I have old parents and son to look after. What can I do, please help me, I have audio conversation of them stating I spent half money on land before registering the 100 yards to my wife.