Stanley Thai's wife is Datin Seri Cheryl Tan Bee Geok. Alongside her husband, she co-founded Supermax Corporation Berhad in 1987 as a modest trading business distributing latex gloves before expanding it into one of the world's leading medical glove manufacturing enterprises. She serves as the Group Executive Director, playing an integral role in shaping the company's operational strategies, international distribution footprint across North America and Europe, and overall corporate governance.