[Summary: sandrews asks if Duncan from the Hedge Knight fathered a family, is the family existant at the time of the books, why Aemon Targaryen did not appear in the story, and whether Dany has any kin in Lys because of Aerion Brightfire's exile.]
The answers to (i) and (ii) will have to wait until I write more stories of Dunk and Egg, or possibly until later volumes in A SONG OF ICE AND FIRE.
As to (iii), well, Aemon was at the Citadel in Oldtown, studying for his maester's chain. He had no part in the story I was telling in "The Hedge Knight," so I saw no reason to drag him on stage.
Lastly, (iv), well, Aerion Brightfire did not stay in Lys all his life, only a few years. He may have fathered a few bastards there, which would mean Dany has "relatives" of a sort in Lys... but they would be very distant relatives, from the wrong side of the blanket.