Property Dispute

We are a family of five - father & mother (both dead) me the eldest, younger sister & younger brother. A) My father had purchased a land in Kolar Gold Fields & built a house, rented it & was staying in that house using the rent derived from the house. till his death on December 2022 B) My mother had purchased 2 lands in Chennai. one land she registered on my younger brothers name & he built a house in that land. my mother wrote on a small white paper that the other land & her jewelry (nearly 100 sovereign) had to be shared between my younger brother & me. I received the land documents which are still in her name. The jewelry was never shared by my brother till date. My brother was the one who take care of my parents till their death. My questions are . 1. for the first part A - my brother has the land documents which are still in my fathers name. He is going to sell & he said that he has some recording of my dad instructing him what to do & that i have no say in that land. he is the sole responsibility of that land/house. how can i prevent him legally from selling & what will be the legal cost. 2. For the part B - what will be the process to register the Chennai land in my name as it is still in my mothers name. is my sister & brother entitled to that land? how can i get my brother to share the jewelry?