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Cassandra Philip and also Foster.
Cara has a soft spot for Philip, and Frank.
Fred holds a special place in the heart of Cassandra, and also Foster.
Cassandra takes delight in being with Fred and
Frank.
Phineas has a special place in the heart of Candy, and Foster.
Cassandra is emotionally attached to both Finn and Ferb.
I hope you find these variations helpful!