No, it is believed that Aberforth didn't know that Credence was his son, at least not until he was told by Albus. Aberforth and an unknown woman had a relationship when they were in Godric's Hollow, but the woman was sent away suddenly, cutting all ties between the two. However, the woman eventually died, giving birth to Aurelius, who was later named Credence. Aberforth had no knowledge of having a son, or at least, he didn't know his whereabouts until he was told by Albus Dumbledore.