The Chearavanont, Yoovidhya and Chirathivat families remain among Asia’s 20 wealthiest dynasties as combined family fortunes hit a record US$647 billion.

Despite a decline in wealth among Thai billionaires, Chalerm Yoovidhya and family became the richest this year due to a sharp increase in energy drink sales last year, according to a report by business magazine Forbes on Wednesday.