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