Oviparous dragon children : born from a dragon (male or female apparently) that has laid an egg that is its genetic copy,
they grow up a little quicker and show dragons' trait (horn, full transformation) early
exemple : the fire dragon making his own grave over there and his son
Viviparous dragon child : born like a human child from to parents with at least one of them being a dragon, has both of the parents gene
mature slower, and show dragon trait latter before adulthood
And I want to remind you that divorce doesn't exist in the dragon race, if you did a bad choice in your mate, you stuck with it for life, no matter how much your relation will wreck your house and children (I think that why they ask so much from viviparous parents)
exemple : Muen, Noah, Rossweisse, Roseweiss' big sister.