The Morales family was incredibly complex in structure. One didn't need to be a genius to understand this, just knowing that they had over a billion youths born into the Nova Generation was enough to necessitate this. Also, these were just the number of youths that had awakened at least one of their Lineage Factors and couldn't represent the total number of youths born into this Generation as a whole.
If there were so many born into just a single generation, then it was all too clear just what kind of scale the Morales family was one.
Things only became more complex in recent times due to the 20 year time dilation. Because of the circumstances, the next generation of youths, the Post-Nova Generation, had already been born. Usually, these youths would be gearing up for their own Heir Wars in just another decade or so, but they had ended up unlucky in this regard.