Bai Mu said that he belonged to the German Third Reich, and his online name was Third Emperor.
Shuduo told Bai Mu that her real name was Shushu, and her online name was also Shushu, which sounded like "uncle".
Bai Mu is Shu Duo's half-brother. Chu Duo is Bai Mu's half-sister. The relationship between the two has always been clear and not ambiguous at all.
Conception: