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Family relationship The family relationship between two individuals, where Ga and Gb are the number of generations between the individuals and their nearest common ancestor , can be calculated by the following:
x = min (Ga ,Ga )
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 child .
If x =0 and y =2 then they are grandparent and grandchild.
If x =0 and y >2 then they are great ... great-grandparent and great ... great-gandchild, with y −2 greats.
If x =1 and y =0 then they are siblings (brothers or sisters ).
If x =1 and y =1 then they are uncle /aunt and nephew /niece .
If x =1 and y >1 then they are great ... great uncle/aunt and great ... great nephew/niece, with y −1 greats.
If x >1 and y =0 then they are x −1th cousins .
If x >1 and y >0 then they are x −1th cousins y times removed.
So two people sharing a pair of grandparents have x =2 and y =0 and are described as being first cousins.
If x >0 and they only share one nearest common ancestor rather than two, then the word "half" is sometimes added at the beginning of the relationship.
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