The kinship analysis is used to calculate the probability of two persons having a certain degree of relationship. This test assumes two persons PK and PL with the genotypes K and L. The algorithm determines the probability of the genotype combination K-L under the condition of a certain degree of kinship for PK and PL. WEIR distinguishes 5 different degrees:

• Full sibling

• Parent and child

• Half sibling, grandparents and child or aunt/uncle and nephew/niece

• First cousins

• Unrelated persons