This would be the same for almost every PC.

With naturally the implication in almost every case the character was adopted, even having a moment where she goes 'I have something to tell you!' 'Yes i know mom I'm adopted I'm an dwarf! IT was sort of obvious!' Once upon a time I was brainstorming nonsense for a campaign, or even how a 4e D&D video game would work (At least the start would be) where all the PCs, regardless of race, would be the child of a female, human, blacksmith in town. One thing is clear - they are not just apex predators, they are apex sexual predators. What I want to know is: Why? What could possibly be the reason for dragons to mate with innumerable other species, many of which are so far removed from their own ancestry that they are in entirely different phylums? And how do they manage to create offspring regardless? So it seems very much possible that in at least one case, a dragon mated with a giant octopus!

She lurks deep among the waters of the blue holes and inland caverns that are found throughout Andros.' 'Lusca is half-shark, half-octopus or half-dragon, half-octopus, depending on who you talk to. In my research on mythological creatures, I came across the Lusca, from the folklore of the Bahamas: The existence of various types of half-dragons in various editions of D&D and the half-dragon template in 3.X suggest that not only can dragons get it on with pretty much anything that moves, but also produce viable offspring! And this apparently isn't limited to D&D, either.

D&d half dragon template