Through his mother Domitia Lepida, Marcus was a great-grandnephew of Augustus.
From the en.wikipedia.org
The US entrepreneur and technology writer Dave Winer is a grandnephew of Arno Schmidt.
From the en.wikipedia.org
Max Farash also made a cash bequest to Matthew Aroesty, his grandnephew.
From the democratandchronicle.com
Again, I have no merit in being a sort of great grandnephew of him.
From the economist.com
He was a grandnephew of Russian poet and translator Nikolay Gnedich.
From the en.wikipedia.org
Grimwade's great-grandnephew Andrew Grimwade is the present patron.
From the en.wikipedia.org
The previous year, her niece died after an illness and she adopted her 5-year-old grandnephew.
From the nytimes.com
Collins'great-grandnephew, Aengus O'Malley, played a student in a scene filmed in Marsh's Library.
From the en.wikipedia.org
Beam, a grandnephew of Jim Beam, said more women are showing up at bourbon tastings around the country.
From the democratandchronicle.com
More examples
Great-nephew: a son of your niece or nephew
In kinship terminology, a cousin is a relative with whom one shares a common ancestor (or ancestors). In modern usage, the term is rarely used when referring to a relative in one's own line of descent, or where there is a more specific term to describe the relationship: e.g. ...
Grandson of one's sibling. brother's grandson (fraternal grandnephew) or sister's grandson (sororal grandnephew) son of one's nephew or niece