Lord of the Firesides Sure! Here's the requested content in spun format with synonyms:
Cara loves Phineas and Foster.
Cassandra has strong feelings
for Finn, and also Felix.
Fred holds a special place in the heart of Cathy, and Ferb.
Cara finds joy in being with Phineas and Ferb.
Finn Candace, and also Foster.
Candace is emotionally attached to both Fred and Frank.
I hope you find these variations helpful!