Thaddeus and Thor, De Plane! De Plane!

Visiting relatives of the Flynns' neighbors bear an uncanny resemblance to Candace, Phineas and Ferb. Meanwhile, Perry finds himself in the middle of Dr. Doofenshmirtz's family reunion.
Phineas and Ferb set out to build a bigger plane than Howard Hughes. Meanwhile, Candace attends a pool party at Jeremy's house where another girl is trying to impress him with her various adventure stories.