Your Extended Family

Collateral relationships are relationships between individuals who descend from common ancestors but who are not related to each other in a direct line. Collateral relationships include your

  • siblings,
  • aunts and uncles,
  • nieces and nephews , and
  • cousins.

Full cousins are individuals who descend from common ancestors by the same number of generations.

  • First cousins have in common two grandparents and their ancestors.
  • Second cousins have in common two great-grandparents and their ancestors.
  • Third cousins have in common two great-great-grandparents and their ancestors.

Individuals who descend from common ancestors by a different number of generations are cousins removed. The term once removed indicates a difference of one generation, twice removed a difference of two generations. For example,

  • your first cousin’s child is your first cousin once removed
  • your first cousin’s grandchild is your first cousin twice removed
  • your father’s first cousin is your first cousin once removed
  • your grandfather’s first cousin is your first cousin twice removed.

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