Tā de zǔfù shì Xiānggǎng yì jiā yángháng de dàbān.
His grandfather was the taipan of a foreign trading firm in Hong Kong.
Tips
usage
A kindergarten's three years are 小班 (ages 3 to 4), 中班 (4 to 5) and 大班 (5 to 6). The taipan sense is old, from the foreign trading houses (洋行) of Guangzhou, Shanghai and Hong Kong, and English borrowed the word from Cantonese.