What is my right to get access to my deceased parents' home?

I am vising Mumbai from overseas. My family member is having the keys of a flat. I had my own set of keys earlier but were handed over to the same family member when I left for a job overseas. My request to provide me keys and access to the flat are not responded by the same family member. The property is vacant for many years but may have some old furniture in it. I want to occupy it for around two months. My whole life since childhood, university and few years of job is spent in this property. The disputed will matter of a parent is dormant in Mumbai High Court. No decisions are made. The case involves the family member above and the other siblings challenging the will. What are my legal rights to live in this property while I visit Mumbai? Your Options in Sub Area of Law are not relevant to my question. This is why I just selected RTI to proceed.