A cousin chart is the common name for a Table of Consanguinity. It identifies the correct name for the relationship between two people using their closest common ancestor as a reference point. This chart uses formal English relationship terms. For a general overview of kinship terminology, see the appropriate section in the article Family.
The term cousin typically refers to the child of one's parent's sibling (i.e. one's aunt or uncl ...
The family relationship between two individuals a and b, where Ga and Gb respectively are the number of generations between each individual and their nearest common ancestor, can be calculated by the following:
x = min (Ga,Gb)
y = |Ga-Gb|
If x=0 and y=0 then they are the same person.
If x=0 and y=1 then they are parent and ...
It should be noted that the above chart is inadequate to explain the relationships which result when two people are both descended from a single common ancestor, but each from a different partner of that common ancestor. Half-siblings are a familiar concept to most people. But it can also be extrapolated out in the same manner as other cousin relationships. For example, if one of John's parents and one of Mary's parents are half-siblings, then John and Mary are half-cousins. The half sibling of each of ...
