Give a stream of consciousness and then the final answer. The father, who represents the Heavenly Father, implies to the older son that his love for both sons is not dependent upon their perfection, but their willingness to return to Him with a broken heart and a contrite spirit.

Answer this question: who does the father represent in the prodigal son?
The relevant information is: The father, who represents the Heavenly Father, implies to the older son that his love for both sons is not dependent upon their perfection, but their willingness to return to Him with a broken heart and a contrite spirit.
So, the final answer is the Heavenly Father.