My late mother and I had signed purchase agreement for flat in MUMBAI in mid 90’s . She and late father both passed away in 2000s. The share certificate clearly shows my 50 % ownership on it. Step mother is now isolating me and fraudulently attempting to transfer name based on an altered probated will and has been collecting rental income since 4 years on this flat because I am residing overseas on work and was not present during the will probate. Society committee has been issued legal notice by my lawyer to not permit any name transfer of my share per settled law.

Questions :

1. What steps do I need to take to reclaim and repossess the flat keys and original flat papers from step mother ?
2. After the deaths of the other 50 %partner does the flat automatically become 100 %mine since i am only one left who signed original purchase agreement ?
3. What steps can i take to ensure step mother does not claim and name transfer other assets mentioned in the fake will which were on my late father’s name ?