There are two other characters in the parable of the prodigal son; the father, and the older brother. Jesus shifts the parable to focus on how the father embraces, restores, and blesses his wayward son when he returns. But then Jesus goes one step further, and contrasts the behaviour of the older son, who was physically present with his father, but just as relationally distant.
But here's the bottom line: No one is beyond the reach of God's love, mercy, grace, forgiveness, and redemption.