User blog comment:Ultimatephinferbfan/Alt. Doofenshmirtz Might not be the main villian./@comment-3473686-20110416210631/@comment-3473686-20110416211611

Uh...I don't think so. Don't you think we would've seen her?

This theory has nothing to do with another villain. This is, why are there no signs of alt parents?