"I have a hunch because I heard that Grandmother is the previous Empress' sister. But who is the princes' mother?" Yao Ying asked curiously.
"The Empress' beloved niece --- in other words, she is also your grandmother's daughter. My sister. Your aunt." Wang Luo Hai explained.
Yao Ying asked in surprise, "I thought that Father is the only son."
"Yes, I'm the only son, but not the only child," Wang Luo Hai smiled.
Yao Ying and Yao Ling looked at each other. 'Well... that's true. They never ask whether the matriarch had another child or not. They just assumed that Wang Luo Hai was the only child.
"Ah... it means Wang Fu is the maternal family of the princes and that's why Wang Fu becomes their backer, right?"
Wang Luo Hai nodded.
"But why do they also want their maternal family to drink the poison? Don't they trust their own maternal family?" Yao Ling asked in confusion.