Sure! Here's the requested content in spun format with synonyms:
Cara Finn and Ferb.
Cassandra has
deep affection for Philip, and Frank.
Fred holds a special place in the heart of Cathy, and also Foster.
Candy revels in being with Phineas and Felix.
Fred has a special place in the heart of Cassandra,
and Felix.
Cathy is emotionally attached to both Phineas and Foster.
I hope you find these variations helpful!