Yes
vanessa's boyfriend
yes
He could marry Isabella, since in Phineas and Ferb's quantim boogaloo the Future Candace doesn't know who Doofenschmirtz is, meaning Ferb doesn't marry Vanessa.
Olivia Olsen
Yes
Ferb and Vanessa
Vanessa Doofenshmirtz on the show Phineas and Ferb is voice acted by Olivia Olson.
vanessa's boyfriend
Yes he does. He married Vanessa but vanessa also have a crush on Johnny her classmate.
Phineas is Phineas Flynn and Ferb is Ferb Fletcher.
57 episodes in total.
vanessa's boyfriend
Vanessa Doofensmirtz
Doofenshmirtz
Olivia Olsen plays Vanessa Doofenshmirts
Vanessa is voiced by Olivia Olson.