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