User blog comment:Kuzlalala/Lala's Long but Orderly Put Theory about Phineas and Candace's Biological Father/@comment-4764787-20110807203853/@comment-4764787-20110811143315

I also wouldn't go assuming just because Perry has such high affections for Phineas is because he's their father and out of "curiosity". Phineas and Ferb have had a long relationship with Perry.