I'm Tang Sanzang's Father

“The prime minister ordered a banquet prepared so we could drink and celebrate all night. The two of them took each other by the hand and entered the bridal chamber together. At the third watch of the next morning, Taizong appointed Guangrui governor of Jiangzhou and ordered him to pack and set out at once, without missing the deadline.”

Guangrui said, “We have already stayed at this inn for three days. The imperial deadline is pressing, so I would like to leave tomorrow. Is Mother feeling well?”

“Miss Yin deeply hated the villain Liu and wished she could eat his flesh and sleep on his skin. But she was pregnant and did not yet know whether the child was a boy or a girl, so with no other choice, she forced herself to go along with him for the time being. In the blink of an eye, they had arrived in Jiangzhou.”

“...My father was once killed by river bandits, and my mother was seized and abused by them. Three months later, she gave birth to me. I escaped with my life in the water, and fortunately, my revered master at Jinshan Temple rescued me and raised me to adulthood...”

Why was Tang Monk born after only a little over four months? Why did the truth come out only at the very end, after eighteen years as husband and wife? Why did Tang Monk enter the monastic life even after rejoining his family? Who was Tang Monk's father, really? How did the biggest plot hole in Journey to the West come about?