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. 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. It includes great-grandparents, great-grandchildren, great-uncles, great-aunts , first cousins, half-uncle, half-aunt, half-niece or half-nephew.
- "First, Second and Third Degree Relative". bcbst.com. Blue Cross Blue Shield of Tennessee. Retrieved 18 August 2016.
- Ludman, Mark (2009). The Encyclopedia of Genetic Disorders and Birth Defects. p. 101. ISBN 9781438120959.
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