The longest-standing tradition of Aona is perhaps the most argued against. Since the first Monarch, only the children (or otherwise related cats) of the Monarch could inherit the crown. In the instance that there were no surviving children or family members of the Monarch who could successfully inherit the crown, the Monarch would appoint a non-related successor. When every Monarch is crowned, they are required to pick a non-related successor, in the chance that when they retire, they have no family to pass the crown down to. 

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Additionally, Aona follows a rule by the name of Cognatic Primogeniture. This means that no matter the gender of the Monarch's children, the eldest child would be the Heir Apparent. For example: if the Monarch had two sons and one daughter, the eldest being the daughter, the crown would pass to her, rather than the eldest of the sons. Each gender is treated equally, and each is equally able to inherit the crown.