0
And Abijam slept with his fathers; and they buried him in the city of David: and Asa his son reigned in his stead. 1 Kings 15:8
Now in the eighteenth year of king Jeroboam the son of Nebat reigned Abijam over Judah. Three years reigned he in Jerusalem. And his mother's name was Maachah, the daughter of Abishalom. 1 Kings 15:1-2And in the twentieth year of Jeroboam king of Israel reigned Asa over Judah. And forty and one years reigned he in Jerusalem. And his mother's name was Maachah, the daughter of Abishalom. 1 Kings 15:9-10
It is possible, I suppose, that Abijam married his own mother (Maachah) and was, therefore, Asa's father and brother.