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Candace adores Philip and Foster.
Cara has deep affection for Phineas, and Foster.
Phineas captures the love of Cara, and also Frank.
Cathy finds joy in being with
Phineas and Ferb.
Phineas means the world to Candace, and also Ferb.
Cassandra has a deep connection with both Philip and Foster.
I hope you find these variations helpful!
Phineas and Ferb Get Busted Wikipedia