A second-degree relative (SDR) is someone who shares 25% of a person's genes. It includes
uncle
An uncle is usually defined as a male relative who is a sibling of a parent or married to a sibling of a parent. Uncles who are related by birth are second-degree relatives. The female counterpart of an uncle is an aunt, and the reciprocal rela ...
s,
aunt
An aunt is a woman who is a sibling of a parent or married to a sibling of a parent. Aunts who are related by birth are second-degree relatives. Known alternate terms include auntie or aunty. Children in other cultures and families may re ...
s,
nephews,
niece
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 an ...
s,
grandparents,
grandchild
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. Ideal ...
ren,
half-sibling
A sibling is a relative that shares at least one parent with the subject. A male sibling is a brother and a female sibling is a sister. A person with no siblings is an only child.
While some circumstances can cause siblings to be raised separat ...
s, and
double cousin
Most generally, in the lineal kinship system used in the English-speaking world, a cousin is a type of familial relationship in which two relatives are two or more familial generations away from their most recent common ancestor. Commonly, ...
s.
See also
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Family
Family (from la, familia) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). The purpose of the family is to maintain the well-being of its ...
*
First-degree relative
A first-degree relative (FDR) is a person's parent (father or mother), full sibling (brother or sister) or child. It constitutes a category of family members that largely overlaps with the term nuclear family, but without spouses.
If the persons ...
*
Third-degree relative
Third-degree relatives are a segment of the extended family and includes first cousins, great grandparents and great grandchildren. Third-degree relatives are generally defined by the expected amount of genetic overlap that exists between two peop ...
References
Genetics
Family
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