Brother, sister, grandparent, or grandchild (relatives in the 2nd degree)
Great-grandparent, great-grandchild, aunt who is a sister of a parent of the individual, uncle who is a brother of a parent of the individual, nephew who is a child of a brother or sister of the individual, or niece who is a child of a brother or sister of the individual (relatives in the 3rd degree)
A husband and wife are related to each other in the 1st degree by affinity.
For other relationships by affinity, the degree of relationship is the same as the degree of the underlying relationship by consanguinity. For example: If 2 individuals are related to each other in the 2nd degree by consanguinity, the spouse of one of the individuals is related to the other individual in the 2nd degree by affinity.
The ending of a marriage by divorce or the death of a spouse ends relationships by affinity created by that marriage unless a child of that marriage is living, in which case the marriage is considered to continue as long as a child of that marriage lives.