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  2. Family tree - Wikipedia

    en.wikipedia.org/wiki/Family_tree

    Example of a family tree. Reading left to right Lucas Grey is the father of three children, the grandfather of five grandchildren and the great-grandfather of three siblings Joseph, John and Laura Wetter. Family tree showing the relationship of each person to the orange person, including cousins and gene share

  3. Pedigree collapse - Wikipedia

    en.wikipedia.org/wiki/Pedigree_collapse

    The House of Habsburg gives a well-documented example of pedigree collapse. In the case of Charles II, the last Habsburg King of Spain, there were three uncle-niece marriages among the seven unions of his immediate ancestry (i.e. parents, grandparents and great-grandparents). His father and two of his great-grandfathers married their nieces.

  4. Consanguinity - Wikipedia

    en.wikipedia.org/wiki/Consanguinity

    It is seldom possible to identify fourth-degree cousins, since few people can trace their full family tree back more than four generations. (Nor is it considered important, since fourth cousins tend to be genetically no more similar to each other than they are to any other individual from the same region.) [ 26 ]

  5. Pedigree chart - Wikipedia

    en.wikipedia.org/wiki/Pedigree_chart

    It can be simply called as a "family tree". Pedigrees use a standardized set of symbols, squares represent males and circles represent females. Pedigree construction is a family history, and details about an earlier generation may be uncertain as memories fade. If the sex of the person is unknown a diamond is used.

  6. Coefficient of relationship - Wikipedia

    en.wikipedia.org/wiki/Coefficient_of_relationship

    Third-degree relatives are a segment of the extended family and includes first cousins, great-grandparents and great-grandchildren. [7] Third-degree relatives are generally defined by the expected amount of genetic overlap that exists between two people, with the third-degree relatives of an individual sharing approximately 12.5% of their genes ...

  7. List of family trees - Wikipedia

    en.wikipedia.org/wiki/List_of_family_trees

    This is an index of family trees on the English Wikipedia. It includes noble, politically important, and royal families as well as fictional families and thematic diagrams. This list is organized according to alphabetical order.