Collateral descendant
Encyclopedia
A collateral descendant is a relative descended from a brother or sister of an ancestor
Ancestor
An ancestor is a parent or the parent of an ancestor ....

, and thus a niece, nephew
Nephew
Nephew is a son of one's sibling or sibling-in-law, and niece is a daughter of one's sibling or a sibling-in-law. Sons and daughters of siblings-in-law are also informally referred to as nephews and nieces respectively, even though there is no blood relation...

, or cousin
Cousin
In kinship terminology, a cousin is a relative with whom one shares one or more common ancestors. The term is rarely used when referring to a relative in one's immediate family where there is a more specific term . The term "blood relative" can be used synonymously and establishes the existence of...

.

Compare with lineal descendant
Lineal descendant
A lineal descendant, in legal usage, refers to a blood relative in the direct line of descent. The children, grandchildren, great-grandchildren, etc...

.
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