How to continue the file for inheritance of brother after filing the case by sister-in-law?

My brother passed away last year at the workplace and as per the Dubai Court, his inheritance is shared by his widow, 3 children and old-aged parents.

I am their only son left now to take care of them. My father is 77 years old, he's bed sick for 3 years now and cannot move and my mother is also 70 years old.

My question is which Dubai court department to approach and what documents are needed to collect their inheritance amount on their behalf from the Dubai Court?

The case was filed by my sister-in-law.