Family Problems And Doubt

Hi there, i am in a very awkward situation and want to know what I must do about it!

Let met start at the beginning, my brother doesn’t like my fiancé at all. So he phoned me and asked me to meet him somewhere because he wants to discuss something with me on Sunday 25 September. So I went to meet him, and he asked me if I think my fiancée is the girl for me.
Because I had some doubts before I told him that I don’t know and I am unsure about what is happening. After the meeting, me and my fiancé went to our ceremony speaker to sort out all the things he needs to know. He saw that something was not right and he decided to call a meeting on Monday night with all the parents, me and my fiancé included. From there we told each other what is bothering us so that we can sort it out. The ceremony speaker decided that everything was my brother’s fault and blamed him for what happened. To put the cherry on top, my fiancés mother send a text message to my brother telling him that he must stay away from her child and the he is low and heartless. My mother and father heard about this and so they called another meeting last night to try and sort out this newly created issue! In the meeting was decided that my brother was not the only guilty one, because I had doubts before hand! Eventually the meeting was finished with my brother saying that he will never accept my fiancé and that we are not brothers anymore while I am with her. After the meeting my parents went to my fiancés mothers house to tell her how discussed they are in her behavior with sending the text message to my brother! Then early this morning my mother phoned me and said that we must postpone the wedding because there is still to much issues to sort out and that the ceremony speaker don’t want to be the speaker if it is like this. This is just a short version of the whole story and my problem is that I am getting married in 3 days, but I don’t know what to do know because all this happened and all the trust etc is down the drain because of this. Could you please give me advice ASAP as I am not able to make my own decisions clearly anymore because of all the 3rd party influence!