The arrest of all three Kwok brothers at the top of Sun Hung Kai Properties in a corruption investigation has deepened concern about succession at the firm.
Their children, the third generation of Kwoks, are not seen as being ready to take command of the listed developer, in which the family retains a controlling stake.
The Independent Commission Against Corruption arrested Walter Kwok Ping-sheung, the firm's ousted chairman and now a non-executive director, on Thursday, the company said yesterday.
The arrest came after the graft-busting agency arrested his two younger brothers, co-chairmen Thomas Kwok Ping-kwong and Raymond Kwok Ping-luen, on March 29 for alleged bribery, along with former chief secretary Rafael Hui Si-yan.
All those arrested are out on bail. None has been charged.
Among the brothers' 10 children, only two work for the company, people close to the family said.
Thomas Kwok's son Adam Kwok, 28, and Raymond Kwok's son Edward Kwok, 27, have been rotating among various departments, such as planning, leasing, construction and infrastructure, to learn the company's business.