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Britannica Sources used in this answer

Which family relationships are consanguineous kin of the first degree?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.
(Left) Absence of inbreeding: horizontal lines connect mates, vertical lines connect parents with their child; (right) an inbreeding loop: horizontal bar at top of loop connects brother and sister, all other lines and bars as above
consanguinity (Left) Absence of inbreeding: horizontal lines connect mates, vertical lines connect parents with their child; (right) an inbreeding loop: horizontal bar at top of loop connects brother and sister, all other lines and bars as above

In the context of consanguinity, which refers to kinship based on the sharing of common ancestors, consanguineous kin of the first degree include the following relationships:

  • Parents and children1
  • Siblings (brothers and sisters)12

Genetically, these relationships are considered to be of the same degree because they involve a high likelihood of sharing genetic material inherited from common ancestors. While the term "blood relative" is often used colloquially to describe such connections, modern science defines these relationships through the transmission of genes via chromosomes rather than blood.123