A more likely scenario would be that Ferb is married to Vanessa, and is at Camp David with his wife President Vanessa Doofensmirtz as she would fit both the birth and age requirement.
Skenario yang lebih mungkin adalah bahwa Ferb menikah dengan Vanessa, dan berada di Camp David bersama istri Presidennya Vanessa Doofensmirtz karena dia sesuai dengan persyaratan kelahiran dan usia.