User blog comment:The Dragon Demands/The History of House Targaryen. Part IV: The Dance of the Dragons/@comment-5014364-20131128170752

Okay, here's the problem:  the except of "The Princess and the Queen" doesn't outright state familial relationships. Thus it doesn't spell out who Baelon and Aemon Targaryen were.

Complicating matters is that....while "Queen Who Never Was" Rhaenys is stated to be a grandmother, she wasn't necessarily Rhaenyra's grandmother. Crud.

She was the mother of both Viserys I and Daemon, but in the index it says she was actually only about six years old than Daemon. So that gets shot to hell. She was the daughter of Aemon Targaryen and Jocelyn Baratheon, wed to Corlys Velaryon, an mother to Laenor and Laena Velaryon. Thus, based on Laenor and Laena alone, she was a granmother:  of Jace/Luke/Joff (allegedly), as well as Baela and Rhaena (definitely).