Path-Counting Formulas for Generalized Kinship Coefficients and Condensed Identity Coefficients

Table 1

The conceptual terms used for two, three, and four individuals.

Two individuals	Three individuals	Four individuals
Common ancestor	Triple-common ancestor	Quad-common ancestor
Path-pair	Path-triple	Path-quad
𝐵𝑖_𝐶(𝑃𝐴𝑎,𝑃𝐴𝑏)	𝑇𝑟𝑖_𝐶(𝑃𝐴𝑎,𝑃𝐴𝑏,𝑃𝐴𝑐)	𝑄𝑢𝑎𝑑_𝐶(𝑃𝐴𝑎,𝑃𝐴𝑏,𝑃𝐴𝑐,𝑃𝐴𝑑)
N/A	2-Overlap individual	3-Overlap individual
N/A	2-Overlap path	3-Overlap path
N/A	Root 2-overlap path	Root 3-overlap path
N/A	Crossover individual	Crossover individual