greatgreatgrandparent
Greatgreatgrandparent, more commonly written as great-great-grandparent, is a genealogical term for an ancestor who stands four generations above the living person: the parent of one’s great-grandparent. The term denotes the generation directly above one’s great-grandparents and is the ancestor you would count as the fourth generation back in a family tree. The unhyphenated form greatgreatgrandparent is nonstandard but encountered in some texts.
In gendered usage, the equivalent terms are great-great-grandfather and great-great-grandmother; when gender is unknown or not
Practically, identifying great-great-grandparents requires reliable historical records such as birth, marriage, and death certificates, census listings,