The Diaoyu campaign should not stop because of David Chan's death, his eldest sister, Chan Lai-ying, said. 'We should not give up until we reclaim the islands,' she said. The eldest of seven children, Ms Chan, 50, broke down when she learned of her brother's death. The whole family knew about his death except their 70-year-old mother, who had emigrated to Canada. 'She's too old to face the news,' she said. Chan had learned to love his country when he was a small boy on the mainland, his sister said. 'He started taking part in social campaigns when he came to Hong Kong at the age of eight,' she said. Chan's youngest sister, Chan Lai-heung, said: 'We wish this had not happened, but we just have to accept it. 'I don't think we should try to find out who is responsible. 'No one could have expected such a tragic thing.' She said the family had been prepared for the worst when Chan left for the islands. 'We knew it was dangerous, which is why we all went to bid him farewell on Sunday,' she said. Asked if it was too high a price for Chan to have paid with his life, she said: 'It depends. 'Everyone places a different value on one's life.' 'I am glad he fulfilled his wishes. He had been pursuing them his whole life. 'He loved his country and he thought he should do something for his country. He will be in my heart forever.' Both sisters and their 40-year-old brother Tony Chan Yuk-kwan worked with Chan at World Perfect Consultants, a media and public affairs consultancy in Wan Chai. Chan was managing director. Andy Tse Ping-kin, local spokesman for the Alliance of Worldwide Chinese for the Protection of the Diaoyu Islands, said although Chan's death was an accident, Japan should be held ultimately responsible. 'They were forced by the Japanese military to jump into the sea as they could not carry out the landing plan when they were surrounded by more than 10 Japanese military ships,' he said. 'It was the only way to show the islands belong to the Chinese,' he said.