Quick canon question

[hakaisha.livejournal.com]

Did the Yeerks ever know that Ax was Elfangor's brother? I could have sworn Ax announced it to either Visser One or Visser Three at some point, and the Visser (I think it was Visser One/Eva) muttering about how "I might have known Beast Elfangor's wretched family continues to be a thorn in my side" or some such.

It's a minor detail for a story, but I cannot for the life of me find the source/quote. (I know the guy from Book 8 overhears Ax's conversation with the Andalites, but I don't think he ever told anyone. The quote I'm thinking of was for a different Yeerk.)

Thanks in advance!

Edit: found it! It's from Book 30, and Ax told Visser One.