Viserys (played by Paddy Considine) is the grandson of Jaehaerys, son of Baelon, brother of Daemon, first cousin of Rhaenys and father of Rhaenyra Targaryen, Aegon II Targaryen, Aemond Targaryen ...

After some debate over whether Helaena is tricking them, Blood and Cheese behead Jaehaerys in his crib ... when she tells her husband/brother Aegon II (Tom Glynn-Carney) that she's afraid.