Third-degree relative

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Third-degree relatives refers to a category of family members that constitutes a segment of the extended family and includes first cousins, great grandparents and great grandchildren.[1] The term is most commonly used in reference to the amount of genetic overlap that exists between two sets of people, with third-degree relatives sharing approximately 12.5% of their genes.[2] It includes great-grandparents, great-grandchildren, great-uncles, great-aunts , first cousins,[3] half-uncle, half-aunt, half-niece or half-nephew.

See also[edit]


  1. ^ "First, Second and Third Degree Relative". Blue Cross Blue Shield of Tennessee. Retrieved 18 August 2016.
  2. ^ Ludman, Mark (2009). The Encyclopedia of Genetic Disorders and Birth Defects. p. 101. ISBN 9781438120959.
  3. ^