piáu-sió-tǐ表小弟

cousin

cousin (mother's sibling's or father's sister's son younger than oneself)

English Wiktionary, “表小弟” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E8%A1%A8%E5%B0%8F%E5%BC%9F · confidence: Medium (Wiktionary, Hokkien)