sè-ko͘-á細姑仔

sister-in-law

sister-in-law (husband's younger sister)

English Wiktionary, “細姑仔” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E7%B4%B0%E5%A7%91%E4%BB%94 · confidence: Medium (Wiktionary)