Probably because he barely had time to tell the stories, Gu Yunxuan did have a great deal to share with Gu Chaoyan when he was asked.
His birth mother passed away when he was still a baby, and he only had one maid left in the yard, who was responsible for taking care of chores. However, he did not dare to share too much with the girl, since he had no idea who this maid worked for really.
As for his other sisters… they weren't born by the same mother, so they might be up to something else as well.
He visited Madame Gu the day before, and wanted to tell her how he was doing and what he planned to do, but Madame Gu ignored his ideas totally and just asked him to assist his brother in the capital city. In the end, he came home in disappointment.