In the ancient history of China, family relationships and hierarchical etiquette have always been the focus of people's attention. However, for Cao Cao, a famous politician during the Three Kingdoms period, his family relationships were not as simple as people imagined. Especially his younger son Cao Gan, who actually called Cao Cao's eldest son Cao Pi "Dad". Why is that?

First, we need to understand Cao Cao's family background. Cao Cao was the founder of the Wei Kingdom during the Three Kingdoms period. He had multiple wives and concubines and fathered many children. Among them, his eldest son Cao Pi and his younger son Cao Gan are the most well-known.

Cao Pi was born to Cao Cao and his principal wife Bian Shi. He was intelligent and clever since childhood and deeply favored by Cao Cao. After Cao Cao's death, he inherited his father's cause and became the second emperor of the Wei Kingdom. Cao Gan, on the other hand, was born to Cao Cao and his second wife Zhen Shi. Although his birth was not as noble as Cao Pi's, he was still Cao Cao's biological son.

So, why did Cao Gan call Cao Pi "Dad"? There is actually an unknown story behind it.

According to historical records, Cao Gan was raised in Cao Pi's mansion when he was young. At that time, because Cao Cao was busy with war and could not take care of the young Cao Gan personally, he entrusted him to Cao Pi. Although Cao Pi was young, he was intelligent and well-behaved, and took good care of his younger brother Cao Gan.

During Cao Gan's growth process, Cao Pi not only played the role of a brother but also resembled his father. He taught Cao Gan to read and write, imparted martial arts and strategies, and explained historical anecdotes and life philosophies to him. Therefore, in Cao Gan's heart, Cao Pi was not only his brother but also his father.

As time went by, Cao Gan gradually grew up. Although he had returned to his own home, his gratitude for Cao Pi never diminished. He always regarded Cao Pi as his father and the most important mentor and guide in his life.

That is why Cao Gan called Cao Pi "Dad". This story showcases Cao Pi's responsibility and dedication as a brother, as well as Cao Gan's gratitude and respect for Cao Pi. Although this relationship may be difficult for outsiders to understand, it is a sincere and profound emotional bond in their hearts.

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