Because you shouldn't be around when your father died, or you didn't always care about him to see him. Why did your father go to see a doctor before he left? Why do you need filial piety? If you are filial, your father will come to help you or your children in the future. You can't dream about him, which means he doesn't remember you or is missing you. Now you dream of him, which means you miss your father. You invited him to see his face. If you are filial, you often do this when your father is dying.
Good is rewarded with good, and evil with evil. A dutiful son is a blessed man. Filial piety depends on what your ancestors left you. It depends on your own ability. Disasters can befall themselves or continue to the next generation. Sounds a little superstitious.
Therefore, making friends with lucky people and treating filial people as daughters-in-law will naturally attract more and more disasters.