Of course, Xi Jiachen also had a biological son.
That would be Gu Zhaohan, who was born to Gu Mingzhu.
Though Gu Zhaohan hadn't grown up in the Xi family, Xi Jiachen constantly thought about his son.
Mainly because his eldest and second sons were disappointments.
Xi Yanbo had mishandled a large portion of the family business shortly after taking over.
Furthermore, Xi Yankai had even less interest in managing the business.
Gu Zhaohan, to his credit, was smart and talented; Xi Jiachen had been quietly observing this son for many years.
His youngest son, just like him in his younger years, was intelligent and composed. He had the potential for great success. Though he was studying medicine, the matters of the business world could still be slowly taught to him.
With all his heart, Xi Jiachen wanted to acknowledge this son as his own and have him inherit the family business, especially as his health deteriorated in the recent years, making this desire even stronger.