Question: are rhaegar and robert cousins?
Answer: Robert, Renly and Stannis are second cousins to Rhaegar, Viserys and Dany. Steffon's mother, Rhaelle, was the sister of Jaehaerys II, Aerys II's father. Rhaelle and Jaehaerys II were the children of Aegon V. ... Varys - “He had Targaryen blood through his mother.”