Mental Harassment by sister over property causing mental trauma

Good morning. (Hindu family) I would need your guidance on an issue my mother and her other sisters are facing by one particular youngest sister over a property (bunglow) which was sold 2 months ago. My mother has 5 sisters, meaning 6 in total. 1st issue :The younger sister is not sharing the amount she has received unfortunately separately while the house was being sold. There were 5 seperate cheques issued and my mother was living in a separate state she didn't receive a cheque on her name, however mutually my other aunts are giving my mother her share but the youngest aunt is adomant. 2nd issue: My youngest aunt is also terribly mentally harassing all the other aunts in the family especially my eldest aunt, which is causing her visibly physical and mental trauma. Please guide me what can my mother and other sisters do against her to stop this horrible harassment? Will appreciate your help highly on this matter! Thank you, Kind Regards Kaneeca New Delhi