Book 14 presents True Parents as more than the restored parents of lineage. They are the first figures to complete the whole ladder of public-hearted devotion: filial child, patriot, saint, and divine child before God.
That helps explain why loyalty to True Parents is treated as loyalty to God. The claim is not merely that True Parents are authority figures. It is that they embody the finished form of the life every other note in the chapter has been describing.
This also turns inheritance into something thicker than agreement. To inherit True Parents is to inherit their course of public love at every scale.