Harassment and Relationship issue

Hello Sir, I have a sister she was married and she have a kid but due to some problem they applied for divorce and case is in court still.In the last year in working place she starting liking some one and they were moving as friend later we came to know about that when we asked but they said they are friends and that person was coming to our house it was good.Suddenly there was some financial problem in my family so my sister fiend only gave us the money in last year ,and my parents said we will give the money back but we need some time and that person said k when ever its possible you can return it back ,the money was taken in last year 2015 dec month.later on after 2 months my sister friend came to home said that i want to marry your daughter but parents said after the divorce we will see and they said your parents has to agree because it was second marriage .we were having financial problem so my sister has to go for work but this person(sister friend) he was having doubt on her no trust,were ever she goes for work she use to work for one month and she use to leave ,she have changed nearly more than 4 company's, nearly 6-7 months we struggled,my sister took some tablets and she was hospitalized she was not well yet all, so we said to my sister its enough to drop from the relationship has he was torturing very much.but my sister whatever we tell she use to listen for 2 days after that again he will msg and they use to compromise.but in the month nov 2016 it was extreme he came to my house fully drunken no stable he was abusing and talking very badly and for me he said your first target and has my father was not there we said you please go now.he went to my sister office and did hungama there she came off from office ,as we were not able to tolerate we gave complaint against him he said i want money back we said will give the money back but we need some time ,and the police people said give him the money back at earliest by December end we said k,he was abusing in police station also but they didn't tell any thing they didn't allow us to write the complaint they said you people will write some thing and all ,so they wrote the complaint and said by december 31st 2016 you return the money and we met SP they said to my sister not be in contact but after two days again my sister started talking they were good only he was also good.My parents tried to arrange the money but we failed in it we need some more time to arrange the money but when we said this things to him that person said i will give complaint and make u people inside and he threatening my sister and my sister is telling that if we wont give money back to him by 31st she will only die. Really don't know what to do please help us to resolve this issue . Amount we have taken is 50,000 and in june 2016 we made agreement that we will pay by june 2017 but suddenly all things happened in the middle he asked so we also agreed to pay by dec-2016 ,now its very difficult to arrange the money.plz i want some time to give the money but police people will be on his side because he will pay money to them .we have financial problem I have 2 more younger sister and my sister kid we have to take care .Request your help. Thanks