He has seven sons; Primus, Secundus, Tertius, Quartus, Quintus, Sextus, Septimus and one daughter Una. He had twelve brothers and killed all of them to become king, even before his father was in any way too old or too ill for the throne.
At the beginning of the film he is close to his death and as four of his seven sons are alive, he decided to cast out the Royal Ruby of Stormhold on his neck and says that the prince who finds this necklace and turns the ruby red again should be the next king.
His son Septimus describes him as strong and courageous. He himself describes him as a very cunning man. He is also very cold blooded, because he incites Septimus to push his son Secundus out of his window.