This distinguishes a cousin from an ancestor, descendant, sibling, aunt, uncle, niece, or nephew.
Upon determining that place along the opposing outside edge for each person, their relationship is then determined by following the lines inward to the point of intersection.
The information contained in the common "intersection" defines the relationship.
The degree of the cousin relationship is the number of generations prior to the parents before a most recent common ancestor is found.
If the cousins are removed, the smaller number of generations to the most recent common ancestor is used to determine the degree of the cousin relationship.
For example if one of the cousins has to go back one generation beyond their parents (the grandparents) before finding the most recent common ancestor and the other has to go back one or more they are first cousins.
If one had to go back two generations beyond the parents (great grandparents) and the other had to go back two or more they would be second cousins A person shares a first cousin or cousin relationship with the children of their parents' siblings. In the example to the right Joseph and Julie are first cousins.This means neither person is an ancestor of the other (descendants and ancestors), they do not share a parent (siblings), and neither is a sibling of a common ancestor (aunts/uncles and nieces/nephews).The cousin relationship is further detailed by degree and removal.Third cousins share at least one set of great-great-grandparents.In the example to the right Sam and Lyla are third cousins.Various governmental entities have established systems for legal use that can precisely specify kinship with common ancestors any number of generations in the past, though common usage often eliminates the degrees and removals, and refers to people with common ancestry as simply "distant cousins" or "relatives".