IOS – Why can’t Siri add the relationship for an account

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I'm using Siri in German, and one of the examples mentions the command:

Meine Mutter ist Diana Pelzl

That is, My mother is Diana Pelzl. So, I say something similar to the above German sentence, and Siri comes up with:

Okay, should I remember that Diana Pelzl is your Mother?

Of course, I tap Yes. Now, Siri replies:

Sorry, I can't add the relationship for this account.

Why would it say so?


Best Answer

Syncing Google Contacts via CardDAV will allow you to store the relationship information in your address book entry. See iOS: Syncing with Google Contacts for instructions.