Tycoon Walter Kwok Ping-sheung was distressed and felt shunned after his two brothers accused him of misconduct in three letters addressed to their mother and directors of Sun Hung Kai Properties, according to a defamation writ filed in the High Court. In the writ, filed on Wednesday afternoon, Mr Kwok, the company's chairman and chief executive, is claiming damages for defamation from his brothers, Thomas Kwok Ping-kwong and Raymond Kwok Ping-luen. He is also seeking an injunction to restrain them from further publishing the statements. Walter Kwok bases his claim on three letters his brothers sent out on April 28 and May 5 that contained allegations concerning his medical condition and business decisions. The writ says Thomas Kwok and Raymond Kwok had turned down Walter Kwok's request for a full and clear public withdrawal of the words and an apology. It says the demand was made in a letter by Walter Kwok's solicitors on May 14 in the belief that his two brothers had published the defamatory words maliciously in a bid to oust him from his positions at the head of the property company. The writ also says his brothers publicised the words to ensure and strengthen their control over the board of directors and to minimise criticism of their management of the group. 'The [defendants] published and/or caused the publication of [the words] having calculated that the benefit they may gain through the publications outweighed the damages that may be awarded to the plaintiff,' it says. 'The plaintiff's reputation has been seriously damaged and he has been shunned and avoided and/or subjected to public odium, scandal and ridicule. 'The plaintiff has also suffered grave distress, anguish and embarrassment.' Walter Kwok obtained an interim injunction from the High Court on May 15 to block a board meeting that was going to decide whether to remove him. He went on leave for three months in February after his brothers 'repeatedly expressed disagreement' with his business decisions, according to a writ he filed last week. It also alleged that his two brothers had orchestrated the diagnosis made by Stanford psychiatrist Jose Maldonado that he suffered from bipolar affective disorder.