As for the third branch of the family not dividing households, it was Old Madam Gu who argued for it. She knew this youngest son was too far gone to be saved, and if the eldest and second sons were tied to him by the father's command, they would have no choice but to care for the youngest.
The regrets of the Gu Family from years ago might be replayed once more.
For the sake of the two children, Old Lady Gu finally spoke to Old Master Gu before his passing, and after a lengthy silence, he agreed.
Yet he still felt uneasy, saying that if the youngest had been raised by them, he would never have developed such a character.
Thus, it's permissible to divide the family, but not to separate households, considering they are ultimately siblings; they should look out for each other somewhat.
Because of this, the third branch still lives together, and because of this, the youngest branch feels the eldest and second branches are taking advantage of him, taking his share of the inheritance.