My sister was about to get married with a guy and we fixed everything where the boy side and the girl side both have done expenses, but unfortunately my sister found out that the boy mental condition is not good as he change his words every second so my sister refused from this marriage
The boy father now started threatening us by telling my mother that we will put manhani case where the boy has not done any engagement he is trying to put his condition which my sister is not able to accept,
Please help what we can do