Marriage problem

Hi, I Vicky facing high level of tensions and I want suggestions to resolve my family problem. I live in m.p. with my family because of my father's job is here in m.p. but my paternal family live in bihar. My problem is that my parents decided to marriage of my elder brother so they choose a girl. Actually my uncle ( father's elder brother) choose that girl. And send us that girls photo so after few months my parents went bihar to physically see that girl. those time my elder brother was working in his new joined company. And my parents called my elder brother to come bihar to see that girl but my brother say no because he was working in new joined company but my parents called him forcefully. So my brother went bihar. It was decided by both family ( boys and girls family) to meet in Temple to meet boy and girl first time. So next day my brother and some family member went to Temple and from girl side they also came, that Place my brother meet first time with that girl and by decisions of both family exchanging of ring done same time and photo session done. And then both family return to their home. Next day some people from girls side came to our home and done other formalities of engagement. And on same date at evening my family went to girls family to complete other formalities. All this happened only in two days and in next day my brother come back to his job. But after few days my brother says that he don't want to marry that girl. My parents asked him why you don't tell us at the time of ring exchanging. And he replied that he don't get time to think. It all was done in very short time so I get confused but now I have decided I don't want to marry that girl. My brother get information that this girl is physically handicapped. So my parents ask to girls family to break this engagement but they are not agreeing. So my parent say that we again want to see girl in Sharee because we get information that girl is physically handicapped but you don't told us. so after few months my parents again went to bihar to see that girl. But girls family refused our demand to show the girl in Sharee.. they told to my parents that you have to marry whether she is physically disabled or not. So my parent told them we will never marry if she is really PH. So girls family told them to go back. So my parents come back to m.p. After few days thy show girl to my uncle and say that look she is not physically handicapped. And forcing us to marry.. my parent asked why you not bring girl in front of us whereas I came to see.. Now my family decided that we don't want to make relationship in that family. But now they are threatening us to complain in police they are saying that they have photos of ring exchanging so you have to marry.. or give us 200000 rs otherwise we will complain in police... So please give me suggestions that what should my family do...