The parents of a grandparent, or the grandparents of a parent are called all the same names (grandfather/-mother, grandpa/-ma, granddad/-ma, etc.) with the prefix great- added, one for each additional generation. One's great-grandparent's parents would be "great-great-grandparents".
To avoid a proliferation of "greats" when discussing genealogical trees, one may also use ordinals instead of multiple "greats"; thus a "great-great-grandfather" would be the "second great-grandfather", and a "great-great-great-grandfather" would be a third great-grandfather, and so on. This system is used by some genealogical websites such as Geni.[8] One may also use cardinal numbers for numbering greats, for example, great-great-great-great-great-great-grandmother becomes six-ex-great-grandma
Individuals who share the same great-grandparents but are not siblings or first cousins are called "second cousins" to each other, as second cousins are the grandchildren of one's grandparent's siblings.
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