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Consanguinity is an old-fashioned term distinguishing relatives by blood from relatives by affinity. Consanguinity refers to the blood relationship between people from some common ancestor; thus, sharing the blood of some common ancestor. Affinity, on the other hand, refers to the relationship between people as a consequence of marriage. Consanguinity has particular importance in marriage statutes

For example:

  • New Hampshire prohibits certain marriages that have a degree of consanguinity. 
  • North Dakota has a similar statute. 
  • Georgia explicitly prohibits marriages that have degrees of both consanguinity and affinity.

[Last updated in June of 2021 by the Wex Definitions Team]