Great-great-great-grandchild's child.
My great-great-great-great-grandchild is a good person.
by Mr. Jacov November 23, 2019
Get the great-great-great-great-grandchildmug. 
The spouse of one's great-grandchild.
My great-grandchild-in-law is a good person.
by Rwopazaq November 24, 2019
Get the great-grandchild-in-lawmug. 
Get the great-grandchildmug.