The three types of unfilial piety refer to: first, not being filial to parents and caring for family members; second, not abiding by one’s duties and acting loyally; third, being unable to uphold one’s moral principles and become a virtuous and virtuous gentleman.

Extended information:

"There are three kinds of unfilial piety, the greatest of which is not having offspring" comes from "Mencius Li Lou Shang". Mencius said this when he evaluated Shun's marriage. According to legend, Emperor Shun's parents were unkind, which resulted in Emperor Shun never being able to marry a wife. Emperor Shun finally had to marry a wife on his own without telling his parents.

Mencius commented: There are three types of unfilial piety, the greatest of which is not having offspring. If Shun married without telling him, he would have no heirs. A gentleman thinks it is better to complain.

There are currently two views on the interpretation of this paragraph: First, Zhao Qi of the Han Dynasty interpreted "hou" as meaning descendants in the Commentary on the Thirteen Classics. Second, later generations of scholars have different views and translations of the article, and tend to understand "after" as "fulfilling the responsibilities of future generations." There is no specific academic conclusion yet.

Reference: Baidu Encyclopedia-There are three types of unfilial piety