Will dispute

Me, my two younger brother and younger sister are legal heir of my mother (shree. Bhanumati Vasanji Kenia). Following property was on name of my mother 1) 9 acer farm in Gujrat – it is on joint name of my mother and we four brother and sisters 2) House at village 3) House at Dadar (Ownership) 4) House at Ghatkopar (Pagadi currently under redevelopment) After her death my youngest brother came up with will which Gives Property 3 to my youngest brother and property 4 to me. There is no mention of property 1 and 2 except last line says if any other property discovered should be divided equally between, we three brothers. When my youngest brother tried to do will probate my middle brother objected even witness of the will clearly said will was not made in front of them. Couple of years back both my younger brothers was partner in same business and there are multiple issues between them related to business properties, Shops etc. My relation with both the brothers are good but all efforts of compromise are failed and they are planning to fight long legal battel. Both my brother and sister agreed to give property 4 to me and they also agreed to divide property 1(9 acer farm into four between we three brother and sister. I have no stake in other two property i.e. house in Dadar and house at village. Since property 4 is under redevelopment I don’t have house to stay and after death of my mother we are not able to windrow rent amount which is deposited by builder in my mother’s bank account. So there is urgency to transfer property 4 on my name. so kindly guide me on following matter 1> When will dispute is running in court property 4 can be transferred on my name based on will and with consent of all 4 legal hair? If yes what is procedure. 2> Can we divide farm into for part with partition deed with consent? And What is procedure and cost. Where I need to apply for proper markings of partition.