Imperious
Without the sun of my life
I mean yes, its parents would have the best claim, but the parents are either dead, tortured into insanity, or otherwise enslaved by the Druchii, and as they aren't really in a position to take care of the egg I didn't really consider them being in the running.
Or it's theoretically possible it's a recently stolen egg, but I find that highly unlikely.
My point is that given how Caledor views dragons as their own fully realized persons I doubt even they would agree with them having "a claim" on the egg, since the egg is a person, not a possession. Some of its family, if there are any in Caledor, may want custody though.