This is a very meaningful question and one that is easily misunderstood or not well stated accurately. Cancer is generally not a typical dominantly inherited disease. It is not true that if a parent has the disease, the child must have the disease, but there is a certain genetic predisposition, or genetic susceptibility, for malignancies. However, the genetic susceptibility of each cancer is different. For example, if the father has liver cancer as mentioned in the question, it is said that the child will not get it if the father has liver cancer. First of all, looking at the common causes of liver cancer, the vast majority of Chinese liver cancer patients have a susceptible background of liver cancer, such as a history of chronic hepatitis B, chronic hepatitis C, alcoholic cirrhosis or severe fatty liver leading to cirrhosis. Whether it is hepatitis B, hepatitis C, or cirrhosis caused by various reasons, it is the continuous damage and repair of liver cells, and in the long-term repair process, it causes the cancerous transformation of liver cells. If patients with hepatitis B and other liver diseases, after early detection of infection, actively go to the hepatology department of infectious disease hospitals for regular examination and proper antiviral treatment to reduce the damage of the virus to the liver, it will stop the trilogy of hepatitis-cirrhosis-liver cancer, and it will also stop the occurrence of liver cancer. Alcoholic liver disease patients abstaining from alcohol and fatty liver disease resulting in active weight loss will significantly reduce or even stop the occurrence of liver cancer. In this way, if the father has liver cancer, if the children are not infected with hepatitis B virus and do not have the habit of alcohol abuse and normal weight, they will generally not have liver cancer and the heredity of liver cancer will not be talked about. However, in any case, once you have a history of liver cancer in your immediate family, you should make it a good habit to have regular checkups in the future to prevent the disease from occurring. Colorectal cancer, for example, also has a small percentage of family heritability, or a tendency to gather in families. In many cases, there are three generations of grandchildren, or many brothers and sisters have cancer, which is a typical family gathering. Therefore, for patients with colorectal cancer, I usually recommend that their close relatives should also be examined by gastroscopy and colonoscopy to find out whether there are any gastrointestinal lesions. Studies have shown that children with one parent with colorectal cancer have a 3-4 times higher risk of developing the disease than normal people. If a parent has multiple colon polyps or has a family history of polyps, it is important to have regular colonoscopies. Once polyps are found, remove them early to avoid progression to colon cancer. Other malignant tumors, such as breast cancer, lung cancer and stomach cancer, have a certain genetic predisposition. If close relatives have the disease, children have to pay attention to regular health checkups. However, there is no need to be nervous, only the risk is high, but not necessarily the development of the disease. Because the occurrence of tumor is a multi-faceted factor, besides genes, the environment of life, diet, and even the psychological state of the patient will affect. A positive and sunny psychology and good immune function will reduce the risk of cancer. Therefore, if there is a family history, it is important to raise awareness of vigilance and health checkups, but tension and anxiety are totally unnecessary. It is still very necessary to do a good job of prevention for yourself and your children.