In fact, when Si Boyi said this to comfort Tong Yao, he was very uncertain in his heart.
He knew Lin Fengying's temperament quite well. She never made empty talks. Since she expressed this idea, it showed she was truly considering it.
Why in the world would his mom cause such incidents when his brother and sister-in-law were fine?
Si Boyi no longer had the mood to care about his father's cause of death. After all, the man had been dead for many years, and living people were the most important. His older brother wasn't at home, and he, being the man on-site who could support Tong Yao, had failed to do so. He felt so shameful that he didn't even dare to meet his older brother in the evening.