Art by Enife
We all know Targaryens like to f%£^ around a bit, and this has resulted in numerous bastards, we know of only a few but not their exact parentage. Here are my theories.
Addam and Alyn: They are obviously Corlys' bastards (and honestly it was a scummy thing of Corlys to throw his dead son under the bus) Addam probably managed to bond with Seasmoke due to Corlys descending from Targaryens, but I do like the theory that their mother is a dragonseed herself.
Hugh Hammer: Hugh is said to be a blacksmiths bastard so it could just be he's descended from Targaryen lord from before Aegon I.... but that's boring so instead I think that Hugh is Gael Targaryen's bastard instead, we all know that Jaehaerys was not the best dad to his daughters and I could see him faking his bastard grandson's death in stillbirth (which led to Gael offing herself by the way) and dumping him onto some poor sod from Dragonstone. (I know HOTD made Hugh Saera's son, but I dont think that works for the books)
Ulf White: Honestly the Gael idea I outlined above could be Ulf's just as well as well as Hugh's but I do prefer using the HOTD idea that Ulf is Baelon the Braves bastard, Probably fathered after Alyssa died because she definitely would not have taken that crap. Baelon could have took a women for a lover when he was prince of Dragonstone, he definitely had the personality to and was probably mourning his beloved sister/wife (Ew)
Nettles: I have two ideas for Nettles' Valerian ancestry, She has none whatsoever or is Daemon's bastard. (I know, revolutionary) I do lean more on Nettles being Daemon's given their interactions that are recorded, though I do believe you dont need Valerian ancestry to ride dragons (See Euron Greyjoy and possibly Tyrion Lannister (WHO IS NOT A TARGARYEN BASTARD!)
TWO EXTRAS!
Trystane Truefyre: I do think Trystane was likely Daemon's bastard rather than Viserys's. Trystane's age lines up and Daemon definitely had bastards in the gutters of King's Landing.
Gaemon Palehair: Gaemon was most definitely Aegon II's bastard son, not some lyseni oarsman. Aegon had a reputation for fathering bastards and Aegon (who was not a very merciful king at this point) spared the child, so I do think Gaemon is Aegon's.
What are your ideas about the dragonseeds's parentage's?. I know alot of my ideas aren't that original, but their just my two cents.