First of all, the practice of the elderly is illegal from the legal level. Because the civil code of our country stipulates that after inheriting the inheritance, if the decedent had debts before his death, he should inherit the debts at the same time. But the inherited debt should be limited to the value of the inheritance. Since Liu gave all his property to his son, his 50 thousand yuan debt should be borne by his son. And Liu's house and car are enough to pay this 50 thousand yuan, so his daughter should not pay this debt for him. Liu may not understand the law of inheritance at all, thinking that by making a will, he can leave his debts to his daughter.
Secondly, according to the law, men and women enjoy equal inheritance rights. Old people themselves should not value boys over girls. Since they want to share the inheritance, they should share it equally. If they need to pay off their debts, they should also ask their children to help them. If the daughter is dissatisfied with her father's will, she can go to court to sue. In the end, the court will definitely divide the property equally.
Finally, if the old man really decides to leave all his inheritance to his son, he should be supported by his son in the future. Even if the son's condition is worse, it is more filial to get his father's inheritance. After all, the daughter has nothing to give, even if he pays less for the elderly, the son has nothing to say. The old man loves his son so much that it is natural for his son to die for him.