Who is Robb Struan from Tai-Pan and what is their importance?

Robb is the half-brother of Dirk Struan. Robb is thirty-three as the book opens, and his brother Dirk considers him to be the brains of the operation. He handled the purchasing and financing for the company. Robb is married to Sarah, who is in the Orient with him and their children. When Sarah wants to return to England, Robb wants to return with her but finally agrees to stay when Dirk obtains the money needed to save The Noble House. Robb agrees to stay for one year. Robb dies in Hong Kong during the fever epidemic.