Contacts were saved on the Google Family Link account, until I tried erasing it. In reality Google would send a confirmation mail to the parent and child's Gmail at the right time to get rid of the enslavement that is that family online plan.
What I did long time ago was deleting both letters on the devices. :facepalm:
Changing date of birth to re-issue it didn't work. And also you're not allowed to set the birth day or year to another before the present one, which is pretty stupid.
The Google account is now in a superposition of not existing and being worthlessly supervised. Some contacts are memorized in it, while others, post-"deletion", on the SIM. On WhatsApp, when editing a name from the first type of contacts, it takes few days to see it the old way again. Editing on Contacts is worse because there's no name-last name subdivision; the "normal" character limit is 20, and for some reason, excluding the space for " • ", you can write up to a whooping 6-7 characters in Japanese.
The only solution is manually deleting and resaving every number, very time consuming because I must do it individually to immidiately keep track of them, and for my bad memory. 😦
Also when is it recommended to use ー, and how do I katakanize names ending with an ending tonic accent, like "José"