User blog comment:Kuzlalala/Lala's Long but Orderly Put Theory about Phineas and Candace's Biological Father/@comment-4068793-20110811123737

Here's an idea... Roger. Hpossibly knew Linda somehow and hooked her up with his brother Heinz for the blind date. The date didn't go well and after a while Linda started dating Roger. The got married, and had Candace and Phineas. However, because Roger was always worrying about himself (as shown in the Beak), they divorced.