Question: Who voices the dad in phineas and ferb?
Disambiguated questions and answers: question: Who voices Phineas and Ferb's dad in Phineas and Ferb?
Who voices Vanessa's dad in Phineas and Ferb?
answer: Richard O'Brien
Dan Povenmire
Natural Questions answer: Richard O'Brien (from the Wikipedia article "List of Phineas and Ferb characters")