The setup Jesus chose was deliberate. He was talking to two groups simultaneously: tax collectors and sinners pressing close to hear him, and Pharisees and scribes standing back, muttering about the company he kept. The parable addresses both groups, one son at a time. The younger son — reckless, wasteful, humiliated into repentance — gets all the famous attention. But Luke 15 opens with Jesus responding to Pharisees who grumbled that he received sinners and ate with them. He told three parables in a row: lost sheep, lost coin, lost sons. The religious leaders were always the audience.
The younger son's journey is genuinely dramatic. He took his inheritance early — which in first-century Jewish culture was as close to saying "I wish you were dead" as a son could come. He burned through everything in Gentile country. He ended up feeding pigs, which for a Jewish listener was the specific image of total defilement. When he came to himself, he rehearsed a speech on the walk home. He was going to offer himself as a hired servant, not a son — he had abandoned any claim to that identity.
The father sees him while he is "yet a great way off." He runs. Running was considered undignified for a man of his age and standing in that culture — you gathered your robes and your exposed legs and you sprinted, publicly. The father interrupted the son's rehearsed speech before he could finish it. Robe, ring, sandals, fatted calf. Every object was a restoration of son-status. The party began.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.