because he is actually a Targaryen, so he is half brother to the dragon queen.
Nephew, not brother.
His father is the mad king,
Rhaegar is his father, son of the mad king, brother of Daenerys.
24 posted on 06/27/2016 8:26:53 AM PDT by Toddsterpatriot
("Telling the government to lower trade barriers to zero...is government interference" central_va)