Sibling's great-great-great-grandson.
My great-great-great-grandnephew is a good person.
by Gtopql November 23, 2019
Get the great-great-great-grandnephewmug. Great-great-grandparent's father.
My great-great-great-grandfather is a good person.
by Mr. Jacov November 23, 2019
Get the great-great-great-grandfathermug. A word invented by Slark. A new word that mixes the word great with the word ness. It itself is greatness.
by The Procter October 18, 2008
Get the Greatnessmug. by M7311 January 5, 2021
Get the as great asmug. Only greatness equals greatness.
by three newtons March 19, 2004
Get the greatnessmug. 
by Josh Shotz April 13, 2015
Get the Greatfulmug.