The relationship between people who have the same ancestors but who do not ascend or descend from each other is

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Collateral consanguinity refers to the relationship between people who share the same ancestor but are not in a direct line of descent (e.g. siblings, cousins). Affinity refers to the relationship created by marriage or adoption. Lineal consanguinity refers to the relationship between people who are directly descended from each other (e.g. parent-child, grandparent-grandchild). Half blood refers to the relationship between siblings who share only one biological parent.

The Relationship Between People Who Have the Same Ancestors but Who