As Deathwing come, it would be important to try to see how exactly Draconic ''family'' (or flights) work.
-First hand, a comparison with a Human concept is a bit inadequate, as it appears that Dragons females can lay hundred upon hundred of eggs. (As proven by Onyxia, oh boy). The love of Drakes for this vary greatly : Alexstraza really love each her of children, Onyxya and Deathwing consider them as cannon fodder. Apparently, the prime desire of an Aspect (or at least one desire) is to keep his brood alive. To a large degree, Deathwing schemes between the War of the Ancients and Cataclysm boils down to stealing eggs of the others flights to try to keep the numbers of his flight up. (including reducing the Red queen to a quite disgusting form of slavery in the process)
-What complicate a bit the matter is the issue that the info available on flights is a bit limited. We know that two flights have female leaders (Green and Reds). Three others have male leads (Blue, Bronze, Black). However, the only real info is about Reds, Blacks, and Blues. Still, what remans is that of the flights we know stuff about, one is based on polyandry (Red), two on polygamy, two widely different systems.
-Both on the polygamy and polyandry system, however, the Aspect have for partners Drakes from a limited pool, the consorts. Do you become a consort because the Queen find your back scales attractive ? Or is this because you are a special kind of drake ? It's worth nothing that Alexstaza ''prime consorts' (uh, favorite ?) in Day of the Dragon was mentionned to be her FIRST consort. Maybe the requirement for being a consort is to be one of the original members of the flight ? (However, that's probably not just it-Drakes obviously age and die, and Alexstraza have younger consorts). However, what is clear is that either there are far less female dragons than males, or that not any kind of female will do, because Deathwing completely lacks any mate ATM. (In one of those ''too much information moment'' that we have sometimes in WOW books, he was apparently a bit rough on his partners. Rough, insane and in flames)