Do I need to amend the sale deed after relatives' death?

I own a flat jointly with my dad and grandmother. Unfortunately, both of them have passed away. I want to know if the sale deed, which includes my name, my dad's name, and my grandmother's name, needs to be amended now that they have passed, or if I can continue using the original sale deed. If I plan to sell the property later, can I affix the death certificates to the deed and sell the property accordingly? I have already updated the property tax records and removed their names, and the property tax bill and electricity bill are now in my name. Please let me know.