Commius' son (Tincommius?), may well have paid homage to Augustus himself.
'The following kings sought refuge with me as suppliants: Tiridates, King of Parthia, and later Phraates son of King Phraates; Artavasdes, King of the Medes ; Artaxares, King of the Adiabeni; Dumnobellaunus and Tincommius, Kings of the Britons; Maelo, King of the Sugambri; ... rus, King of the Marcomanni and Suebi. 2 Phraates, son of Orodes, King of Parthia, sent all his sons and grandsons to me in Italy, not that he had been overcome in war, but because he sought our friendship by pledging his children.' - Res Gestae, 32
Epigraphy (coins etc.), found in the territory of the British Atrebates, gives the impression that Tincommius was in fact a King of the Atrebates; but whether he was relative of Commius is not clear. However, the fact that a king of the Atrebates sought help from Rome in the time of Augustus indicates that the anti-Roman tribe of the Catuvellauni - a neighbouring tribe to the pro-Roman Atrebates - may well have started to expand into Atrebate land earlier than previously thought. Though this being said, Tincommius' homage could have just as easily have been as a result of civil war in his kingdom.