Guidance for distribution of property after death

Dear Experts,

I have bought a rediential flat in co-op hsg soc in Mulund area of Mumbai. There are 3 co owners in the property viz Myself, my wife and my grandmother and all the 3 co owners are also the applicants in the home loan availed for the purchase of this property. All three of us have equal share in the property.

Now as the age of my grand mother is 84, I want to make sure that there are no legal complications after unfortunate event of her demise.

My grandmother has 5 childrens, 3 daughters who are married and 2 sons out of which one has passed away (my father) and only one is alive.

I request if someone could guide me to make my case clear so that there is no hassle from any of the legal heirs of my grandmother.

Also, do let me know if I need to furnish any more info for better understanding of the situation.

Thanks in advance