My dad is losing his livelihood
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Background:
My dad has two elder brothers (they both have lucrative corporate jobs 4 lakh per month, eldest has just retired). My dad suffered ear damage in his childhood so my grandparents pulled him out of school before he could complete 12th and made him do work in partnership with my grandfather's youngest brother after which it dissolved he got compensated with 5 lakhs this happened 20+ years ago. Then grandfather used my dad's money and his 2nd eldest brother's money(no proof of that) to buy a shop in Grandma's name for 11 lakhs. My dad opened a pharmacy in that shop and has been operating it solely(the business and all bills are in his name). Our family has an apartment style house with 4 floors, front side 3bhk(70 lakhs) and backside 1bhk(35 lakhs) and a hall on ground floor same size as 1 bhk. Grandfather owns all of it. We live on 4th floor 3bhk, 2nd eldest on 3rd floor and the eldest in noida and he gets rent from 2nd floor 3bhk. The grandparents live in 3rd floor 1bhk and they take rent from the 1bhk of all floors (+ 50k pension from his govt job). There is a storeroom on the terrace of which my family's stuff was moved out into a makeshift room made of steel roofing sheets and only the the other two brother's stuff is kept in the proper storeroom. We have a flat in noida worth 1cr now we bought on a 20 year loan of which 18 years are left and all the other brothers are jealous that how could my dad move ahead in life. Our shop has very low sale, we have almost no savings all my dad's earnings go into my college fees and brother's school and coaching fees. My grandpa does come sit on the shop for 1hr each in lunch and dinner time (so that my dad can go home to eat) but only because he gets bored sitting at home. My dad now wears hearing aids and he still can't hear properly, his hearing has gone by 90%.
Present:
Now the 2nd eldest brother wants the whole ownership of the shop and says if my father wants to continue working we have to pay 35k in rent which is just not possible. Since the registry is in Grandma's name, she has the power and and she has already given the registry and her aadhar and other documents to hum and will easily transfer the ownership to him. That brother also demands that if shop is not given to him he wants ownership of all the 1bhk flats instead which the grandparents won't do. There have been 5-6 meetings discussing(more like fighting) on this property dispute, which we have recorded on our phone secretly. My grandfather used come at our home seperately and tell us things about he will manage and not transfer ownership and such but then he would just blatantly refuse in the next meeting in front of everyone. We have recorded his private conversations with us too. We said we will agree if the shop ownership can be divided in half between both brothers since my dad has worked there for 20+ years now and now with his condition he can't even change jobs. They said he worked there rent free for 20+ years so now he deserves nothing. We said to the grandparents if you are transferring the whole shop to him, atleast give my father one of the 1bhk flats on the 1st floor. But they said they will keep the both the 1st floor and ground floor flats for themselves. Also this house was rebuilt for which all brothers gave 10 lakhs each and my grandfather has repaid both of them, but has yet to repay my father. They keep saying to sell our noida flat to buy back this shop, which makes no sense since even the emi of that flat is higher than the rent it pays and also the shop isn't running that well to buy it now and in few years my father won't be able to work properly anyways. We have refused to leave the shop and pay any rent. In a few days my grandmother will tranfer the ownership to him. My grandparents have always favoured the two elder brothers over my father. He was always treated as a servant. After marriage my mother noticed it and fought back and that's why everyone hates her too that she "gets angry easily". The 2nd elder brother's wife lies a lot, I have witnessed it many times and now she just says makeup things to my grandparents to turn them against us. Both of them are saying they have no money and we apparently have a lot, even though he has worked in hong kong and Japan for several years before coming back to India. We are thinking of fighting a legal court case since there is no other choice. My father is getting nothing out of losing this shop.
I humbly urge anyone to provide any advice or support of they can.
TL;DR my father had hearing issues in his childhood, made to work, opened a shop in Grandma's name made to work there for 20+ years assuming it will be named to him, now the grandparents are giving it to his elder brother who is pretty rich(worked in many MNCs). We have almost no savings and the loss of livelihood will have adverse affects since my college and my younger brother's school is left, we need advice and urgent help