Some reports have a number next to each individual.
If you want to know what the numbers mean, read below:

Henry Numbering System
 
The Henry numbering system is a way of numbering descendants of a person.  It is named after Reginald Buchanan Henry, who used the system in his book "Genealogies of the Families of the Presidents." The starting person is given the number 1. His first child is numbered 1 1, his second child is 1 2, his third child is 1 3, etc. The children of 1 2 are 1 2 1, 1 2 2, 1 2 3, 1 2 4, 1 2 5, etc. Each person's number starts with his parent's number and adds a digit to represent his position in the family. Thus if a person has the number 142835, he is in the sixth generation (there are six digits), and he is the fifth child of the third child of the eighth child of the second child of the fourth child of the starting person.
If there are more than 9 children in a family the numbering continues on with capital letters in the alphabet, A to Z, where A is 10, B is 11, C is 12, etc.