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