This is inside the Imperial Palace, where only the Old King resides.
Although Chen Yao and Chen Menglu's family have a room here, they are not allowed to stay here regularly.
Because their grandmother (the Old King's second wife) said that before their grandfather fully accepts her, Chen Wei should live outside with his wife and children, to provoke the Old King.
The Old King's second wife believed that even if he didn't care for her, he should care about their children, which is Chen Yao's father. So this Old Queen intentionally had her children take the grandchildren to live elsewhere, hoping to provoke the Old King.
Of course, this provocation went on for more than ten years, yet the Old King never went to see the Old Queen nor asked Chen Wei to bring his wife and children back to the palace, so Chen Yao's father, Chen Wei, had no choice but to live outside with his wife and two children, which is why Chen Yao says this is not their home.
