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they're sorta' like the Prodigal Son, behaving badly while professing their Christianity.
No, the prodigal son turned his back on his father and freely and purposely sought a life seperate from him and his influence, approval, love, etc.

In your example with TK and Rory, they would better fit the example of the other son. We don't know from the story if, after the initial bitterness and anger, he actually matured and got over it, or if he continued to live in resentment toward his brother.