子孫
しそん · shison · JLPT N2 · noun
offspring
🌳 子 = child + 孫 = grandchild; together they mean all descendants
子 (child) and 孫 (grandchild) combine to name the whole line of descent, not just one generation. 孫 is a child's child, so 子孫 covers everyone below you in the family line.
子 — pictograph of a baby/child with arms out
子 began as a pictograph of a swaddled infant with a large head and outstretched arms, originally meaning 'baby' or 'child.' From there it broadened to 'son,' 'offspring,' and a respectful suffix for masters like 孔子 (Confucius). It also became one of the twelve earthly branches.