Nope, they're both dudes (brothers as well), and not following the Goodrum-esque ways of the Kielbasa.
They (the colored bros Rhaegar and Viserion) will be there for the final battle against Whitey. (White Walkers)
Drogon will still dwarf them though, a la prime-Markus Ruhl vs Branch Warren.
so bottom line, long term...
lannisters, tyrells, boltens, greyjoys... they'll all melt away, and the show will come down to (possibly siblings) jon snow and khaleesi uniting to defeat the white walkers?
And then bran's magic time travel communication abilities will tell ned stark to STEP UP and claim the throne when the mad king fell... and we'll see a century of prosperity and unity for westeros as the starks run the iron throne? An alternate reality where our fallen favorites are all happy? Joffrey will be a well-adjusted school teacher, Robert baretheon will be sober and hunting boars with a smile... all of the fallen dead will have better fates and the viewer is floored with happiness.
Why introduce something as massive as time travel communication if they're not going to use it?