четвероюродный

Etymology
From, with by analogy with  (see there for further details).

Usage notes

 * There is no single equivalent of this term in English. It is applied to close relations (e.g. brothers, uncles, grandfathers) and indicates a relation that is in the same generation as the term being modified, but is three degrees greater in separation in terms of the closest common ancestor. For example, the четверою́родный equivalent of one's brother is one's third cousin, because one has a common father with one's brother, but a common great-great-grandfather with one's third cousin. (Logically, to find the четверою́родный equivalent of a given relation, find the nearest common ancestor, go three generations up, and then go three generations back down, following different children.) See the table at for more information.