Sure! Here's the requested content in spun format with synonyms:
Cathy is crazy about Finn and also Ferb.
Candace has a soft spot for Phineas, and Frank.
Philip holds a special place in the heart of Cara, and also Felix.
Cassandra takes delight in being with Phineas and Felix.
Fred means the world to Candace, and also Foster.
Cathy has a deep connection with both Fred and Foster.
I hope you find these variations helpful!