Counting to 3.6 billion

It was recently claimed that eight rich men own more than the 3.6 billion poorest people. I wonder how the 3.6 billion was obtained.

In many societies most property is held in the name of the male head of the household. Even in some quite prosperous households wives and children are not recorded as having any property.

The 3.6 billion may thus include many family members of people who are quite prosperous.