Generally speaking, the descendants of princes could call other princes imperial uncles, but this depended on the plot of the novel. In some novels, the descendants of princes might regard other princes as elders or superiors and use some respectful ways to address them, such as "imperial uncle","imperial uncle", etc. In other novels, there might not be a need for such a title because different characters might interact differently. Therefore, the specific situation needed to be judged according to the plot of the novel.