User blog comment:The Dragon Demands/The History of House Targaryen. Part IV: The Dance of the Dragons/@comment-1164470-20131103111402/@comment-1164470-20131103211252

''Viserys I is Jaehaerys I's *grandson*, so we cannot simply insert another intervening generation. It is "Jaehaerys I-->???-->Viserys I"''

If it was "Jaehaerys I-->Aemon-->Rhaenys-->Viserys I" that would make Viserys I his *GREAT*-grandson....which is impossible, given that the books have stated he was his "grandson" not "great-grandson".

This leads me to suspect that Aemon may have been a younger brother of Jaehaerys and Alysanne.

Baelon was apparently Jaehaerys I's son, though I cannot confirm this.

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If Aemon and Baelon were brothers and if Viserys is the son of Baelon and Rhaenys, he is the grandson AND the greatgrandson of Jaehaerys at the same time (the magical of incest ^^). So i don't see any issue.

And the fact that Jaehaerys CHOSE Baelon as heir tends to show that he wasn't the natural heir. So probably not the eldest son.

Thanks for clarification about Rhaena ^^. I already had Aenys's informations but still great to have it confirm !

For Jeyne Greystone : I worked as consultant with the team that wrote the video game scenario (as you may know, Cyanide is a french studio) so I know for sure that the scenario has been validated by GRRM (in fact they wrote a dozen of scenarios until he valid one) and reread by his assistant Ty several times. So we consider the info as semi-canon (i.e. : canon until it is said something different in the books)

Thanks for all your help :D