Yeah, the way it works now is if one parent with sorcerous power has a child, most likely the child will be born with a lower magnitude than the parent. However, if both parents are sorcerers the child has a much higher chance of being born with the same Magnitude as the parent with the highest level and even a small but decent chance that your child will be born stronger than either parent.
So, a CroakerxLady or MurgenxSahra situation?
With Booboo as equal and Tobo as a 'stronger than either'?