They should have had Octavian’s daughter Julia, and Livia’s son Tiberius make a brief appearance.

Livia was pregnant with Drusus when she was married, which would be hard to ignore, and the show makes it seem like she only had one child. They could have at least have had Octavian mention he was divorced, and had a daughter, if its too much to have them appear. I know Rome has some blatant historical/timeline inaccuracies and Season 2 was rushed, but these omissions really mess up the whole Julio-Claudian family tree.