sǐ-tōa序大

old

old; senior; eldest within the same generation (such as among siblings or cousins); older generation

English Wiktionary, “序大” (CC BY-SA 4.0) — https://en.wiktionary.org/wiki/%E5%BA%8F%E5%A4%A7 · confidence: High (Wiktionary, PH/Quanzhou/Jinjiang)