嫂子
sǎo zi · HSK 7
older brother's wife
👩 嫂 = 女 woman + 叟 elder; the woman married to an elder brother
嫂 pairs the 女 woman radical with 叟 (an old man, an elder), pointing to the woman wed to the senior brother. 子 is a common noun suffix here, so 嫂子 is the everyday word for an older brother's wife.
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.