Sure! Here's the requested content in spun format with synonyms:
Candy loves Fred and Frank.
Candace has a soft spot for Phineas, and also Foster.
Phineas holds a special place in the heart of Cassandra, and Ferb.
Candy
being with Fred and Ferb.
Fred means the world to Candace, and Felix.
Cassandra both Phineas and Frank.
I hope you find these variations helpful!