Family Modding Issue

[slothinator]

Hi, I've been working on an alternate history mod where I'm adding a new family and I can add all the characters I want but the game adds in some extra children to characters 522 and 523 without me asking (it looks like those children always have the same name, which I found weird).
Does anyone have any suggestions? Here is the character setup code I'm using:

...  
    522={
        first_name="Ochus"
        family = c:PER.fam:Achaimenid
        birth_date=416.1.21
        culture="pasargadi"
        religion="zoroaster"
        father="char:518"
        mother="char:519"
        add_gold=1000
        add_popularity=70
        add_trait="achaemenid"
    }
    523={
        first_name="Parysatis"
        family = c:PER.fam:Achaimenid
        female=yes
        birth_date=406.4.15
        culture="pasargadi"
        religion="zoroaster"
        father="char:516"
        mother="char:515"
        marry_character=char:522
        add_gold=250
        add_popularity=40
        add_trait="achaemenid"
    }
    524={
        first_name="Parysatis"
        family = c:PER.fam:Achaimenid
        female=yes
        birth_date=432.10.10
        culture="pasargadi"
        religion="zoroaster"
        father="char:522"
        mother="char:523"
        add_gold=125
        add_popularity=20
        add_trait="achaemenid"
    }
    525={
        first_name="Darius"
        family = c:PER.fam:Achaimenid
        birth_date=434.8.8
        culture="pasargadi"
        religion="zoroaster"
        father="char:522"
        mother="char:523"
        add_gold=500
        add_popularity=50
        add_trait="achaemenid"
    }
    526={
        first_name="Arses"
        family = c:PER.fam:Achaimenid
        birth_date=442.3.2
        culture="pasargadi"
        religion="zoroaster"
        father="char:522"
        mother="char:523"
        add_gold=250
        add_popularity=40
        add_trait="achaemenid"
    }
...