His sister and both his legitimate sons, Xanthippus and Paralus, died during the Plague of Athens. Just before his death, the Athenians allowed a change in the law of 451 BC that made his half-Athenian son with Aspasia, Pericles the Younger, a citizen and legitimate heir, a striking decision considering that Pericles himself had proposed the law confining citizenship to those of Athenian parentage on both sides.