True.. I have taken the “Trivia” of the wiki page for granted without looking for sources.
The wiki page’s edit history is quite strange too, it never stated why it was added that his kids are nearly as strong as him, it was just added one day without a reference.
The closest we have is in this message - which still proves nothing - “Its also stated by Warren that actual curse holders such as Wotan’s children could easily kill all of you, even Morden”.