Wong Nai Siong
Wu returned to the Straits Settlements in 1903. Some time after that, he married Ruth Shu-chiung Huang, whose sister was married to Lim Boon Keng, a physician who promoted social and educational reforms in Singapore. The sisters were daughters of Wong Nai Siong, a Chinese revolutionary leader and educator who had moved to the area from 1901 to 1906.