Why did Cao Zhao Gang and Liu Hongyu not wait for their only daughter Cao Qian to return home before they died?

Why did Cao Zhao Gang and Liu Hongyu, who had loved their daughters all their lives, still not wait for their only daughter Cao Qian to return home before they died? In 2018, Cao Zhao Gang and Liu Hongyu, under the guidance of enthusiastic people, wrote a letter to the Chinese Consulate General in Hamburg, Germany, under the guidance of enthusiastic people, under the guidance of the only daughter Cao Qian, and also posted on the Internet, asking people to write a letter and send it to the Chinese Consulate General in Hamburg, Germany, hoping that the Consulate General could help find the whereabouts of their daughter Cao Qian, and also posted online, please help Find the whereabouts of Cao Qian among Chinese friends in Germany. The Consulate General has searched in many ways, but there is no such person. Cao Zhao Gang and Liu Hongyu who heard the news burst into tears, just when the two old men were about to despair, a German Chinese friend broke a surprising news, Cao Qian had returned to Shanghai on August 5, 2004, found a male friend, and stayed in Shanghai for twelve days, during which he did not return to his hometown in Dalian to visit his parents, and after twelve days he returned directly to Hamburg, Germany, and now Cao Qian is no longer called Cao Qian. Sorry, I changed my name after graduating with a PhD in Germany and am now a tenured professor at the Faculty of Humanities at the University of Munich in Germany. Not only that, Cao Qian has long been married and a mother. Hearing the news that their daughter was still alive, the kind and simple Cao Zhao Gang and Liu Hongyu were both happy and sad, happy that their daughter was not only alive, but also living well. Sad thing, why for 17 years, my daughter did not want to go home to see them, even refused to call one. Looking at the sad looks of the two old men, many neighbors could not look at it anymore and accused Cao Qian of being cruel and filial piety. In 2020, just when the eyes were looking forward to the hopelessness of the daughter, cancer quietly found them again, but compared to the torture of the disease, the daughter's reluctance to go home made the old couple more painful. There is also 19 years ago, in order to let the daughter be able to study abroad, the old couple borrowed money everywhere, the debt owed has not been paid up so far, which makes the old couple very ashamed and embarrassed, can only let the house pay back after death, just when the old man is dying, he does not forget the main father, help them find the daughter's people, as long as they know that the daughter is still alive, we do not want him to retire, you must not expose it, otherwise he can live in the future, soon after, Liu Hongyu died of breast cancer, And Cao Zhao Gang also left this earthly world that could not make him clear in the end, and finally could not wait for his little cotton jacket to see him for the last time. At the end of 2020, not long after cao Zhao Gang and Liu Hongyu died, someone found Cao County in Munich, Germany, asked him why he treated his parents so cruelly, Cao Qian did not have the slightest guilt, replied, I am too busy, there is no time to go home, their desire to control is too strong, this is the main reason why I fled. A woman who calls her parents when she lacks money, who is not short of money, who has not called her parents for 17 years, can say such things with a clear conscience, a woman who does not look at her parents for the last time when her parents are dying, even if she succeeds, her life is the biggest loser, because he has nothing but money and materials. Mixed in with our hatred of the filial piety daughter Cao Qian, as parents, should we not reflect on how such an unfilial child as ourselves is cultivated? According to my observations over the years, almost all the filial piety children are habitually produced by their parents or grandparents, grandparents, grandparents, and so is Cao Qian, who has also been used to Cao Zhao Gang and Liu Hongyu since childhood, and has spoiled Cao Qian into a princess since childhood. That is to say, the pampering and doting of parents, grandparents, grandparents and grandmothers is the biggest source that leads to the endless emergence of rebellious sons and filial piety.