Chinese developer Country Garden has elevated the country's richest woman Yang Huiyan to Co-chairman alongside her father. Previously a Vice-chairman, the 37-year-old, who is worth nearly $18 billion, will assist her 64-year-old father and Founder Yeung Kwok Keung in the day-to-day running of the business. Yang owns 57% of Country Garden, a stake largely transferred to her by her father.