Board Thread:Questions and Answers/@comment-34348110-20180115090845

Can someone please help me understand the following : Rhaegar Targaryen married Ned Stark's sister, and they had two children,one of whom was John Snow. Furthermore, he died in a battle with a *younger Robert Baratgeon, well before the HBO series commences, right? However... Rhaegar also has a younger sister, namely Daenerys Targaryen. Daenerys is now a contemporary of John Snow. So Rhaegar would have been at least as old as Ned Stark at this time, were he still alive. It seems as though he could not be Daenerys' older brother, simply in terms of the years between them? 