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I don't think that's an event, but some hardcoded logic. You could try creating some on_action events using on_employer_change.
 
I don't think that's an event, but some hardcoded logic. You could try creating some on_action events using on_employer_change.
Update: I've "found it" by using charinfo and hovering over the event popup (xxx returns to my court). The file is titled missingchildren_events.txt.
The weird thing is it's not in any of the event files. It seems to be one of those files hidden in the exe or something.
I just added a copy of that file to my mod and changed a few things, in the hope that it overwrites the vanilla event, and it seems to have worked.

Thanks for the help. I'll update if a problem arises.