A second-degree relative (SDR) is someone who shares 25% of a person's genes. It includes
uncles,
aunts,
nephew
In the lineal kinship system used in the English-speaking world, a niece or nephew is a child of the subject's sibling or sibling-in-law. The converse relationship, the relationship from the niece or nephew's perspective, is that of ...
s,
nieces,
grandparents,
grandchildren,
half-siblings, and
double cousins.
See also
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Family
Family (from la, familia) is a group of people related either by consanguinity (by recognized birth) or affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its members and of society. Idea ...
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First-degree relative
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Third-degree relative
References
Genetics
Family
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