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This image made from video taken on April 19, 2019 shows Song Xinling (L) and Wu Dingfu looking at photos of their son Wu Guofeng, at their home in Chengdu, in southwest China's Sichuan province. - Wu Guofeng was found dead in Beijing on June 4, 1989. Three decades after the deadly crackdown on the Tiananmen Square protests in Beijing, relatives of the victims are still demanding to know the truth about the most taboo subject in modern Chinese history. (Photo by EVA XIAO / AFP) / To go with AFP story China-politics-Tiananmen, FOCUS by Ludovic Ehret and Eva Xiao (Photo credit should read EVA XIAO/AFP/Getty Images)

This image made from video taken on April 19, 2019 shows Song Xinling (L) and Wu Dingfu looking at photos of their son Wu Guofeng, at their home in Chengdu, in southwest China's Sichuan province. - Wu Guofeng was found dead in Beijing on June 4, 1989. Three decades after the deadly crackdown on the Tiananmen Square protests in Beijing, relatives of the victims are still demanding to know the truth about the most taboo subject in modern Chinese history. (Photo by EVA XIAO / AFP) / To go with AFP story China-politics-Tiananmen, FOCUS by Ludovic Ehret and Eva Xiao        (Photo credit should read EVA XIAO/AFP/Getty Images)