Property Rights

My grandfather have 3 sons. Elder son was married and after a years he become a father of a son. The Second son also married and he become a father of 2 sons. The 3rd son of my grandfather was still unmarried. My aunt (wife of 1st son of my grand pa) was married with my uncle (3rd son of my grandfather) with taking a divorce from her first husband i.e. 1st son of my grandfather. After the marrige of my uncle and aunt (the 3rd son of my grandfather and wife of 1st son of my grandfather) have 3 sons. and after the 10 years my uncle (1st son of my grandfather) was died since he was shocked by his wife activity. Firstly he was become mad and thereafter he was died. Now the question is whether property of my grandfather will divided into three share or divided into two share. Since the son of my uncle (1st son of my grandfather) is still staying with his mother or deemed to stepchild of my uncle (3rd son of my grandfather) and property will divided into two share i.e 2 and 3 son of my grandfather. Kindly suggest to me.