Lawrence Fletcher

Dad is Ferb's biological father, who married Phineas' mother Linda at some point before the show begins. He is obviously English, does not appear in every episode, and rarely makes an impact on the plot. A running gag is how the Dad is engrossed in some activity (such as finding a parking spot in "Candace Loses Her Head" or cleaning out the garage in "Rollercoaster") and missed the exploits of Phineas and Ferb completely.