In joint house agreement one owner is no more than what is legal procedure

My mother died intestate. I am joint owner of the property and EMI is getting deducted from my bank account. Property is located in Thane Balkum. We are total 5 sibling including me (4 sisters and 1 brother). My father past away few years back. I am aware about the fact that my mom's shares will get equally divide among all five of us. 1) if we want to transfer 50% of my mom's share on my brother's name then we need to prepare Power of attorney or Gift deed or relinquishment/Release deed ? what is the difference between these deeds? 2) What are the charges(stamp duty, registration, any other charges as per Thane act) do we need to pay to prepare Power of attorney or Gift deed or relinquishment/Release deed 3) I want to transfer my loan to other bank to reduce ROI, will I have to face any issues once I have prepared the deed while transferring the loan, as I have heard that bank doesn't provide loan if sibling takes loan together. 4) Also society is planning for Redevelopment, will this also get affected if we make my brother as 50% owner? Thank you for your help