Cousin

A cousin is a relative who shares a common ancestor with another person but is not their sibling, ancestor, or descendant. Cousin relationships are classified by degree and generation.

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Kinship: Kinship is the network of relationships created through descent, marriage, or adoption. Cousins occupy a position in kinship networks through shared descent.
First cousin: A first cousin is the child of a person's aunt or uncle. This is the standard example of cousins whose parents are siblings.
Cousin marriage: Cousin marriage is marriage between people who are cousins. Marriage between cousins is permitted, restricted, or prohibited differently across societies and legal systems.
Sibling: A sibling is a person who shares one or both parents with another person. Cousins share an earlier ancestor, while siblings share a parent.
Common ancestor: A common ancestor is an individual from whom two or more people descend. Cousins are connected by one or more shared ancestors.
Second cousin: A second cousin shares great-grandparents with another person. The shared ancestors are one generation farther back than for first cousins.
Consanguinity and genetics: Consanguinity and genetics concerns how shared ancestry affects inherited genetic variation and disease risk. Cousins may share recessive genetic variants inherited from common ancestors.
Second cousin once removed: A second cousin once removed is a second cousin separated from another person by one generation. This term combines a more distant shared ancestor with a generation gap.
Generation: A generation is a level of descent in a family lineage. Generation difference distinguishes cousins from cousins once removed.
Cousin once removed: A cousin once removed is a cousin separated by one generation. Removal names the generation gap between two people with a cousin relationship.