来らい孫そん

noun

great-great-great-grandchild; fifth-generation descendant

A precise kinship term for a descendant five generations down (child → grandchild → great-grandchild → great-great-grandchild → great-great-great-grandchild). Rare in everyday conversation; mainly encountered in genealogy, historical contexts, or formal family records.

• 家か系けい図ずを調しらべると、来らい孫そんの代だいまで記き録ろくされていた。

  When I examined the family tree, it was recorded down to the fifth-generation descendants.