玄孫
also: やしゃご
げ
ん
そ
ん
Meanings
1
great-great-grandchild; fourth-generation descendant
Refers to the child of one's great-grandchild (four generations down). The reading げんそん is formal; やしゃご is the common colloquial reading.
He is my great-great-grandchild.
I'm looking forward to seeing my great-great-grandchild's face.