The brother who stayed home was jealous, because the brother who spent his half of their father's fortune was welcomed home afterwards, and a party held for him. (It was worth half his fortune to the father, if the prodigal son had truly learned his lesson.)
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The entire parable of the 'Prodigal Son' can be found at Luke 15:11-32.
The 'climax' would have to be when the son humbled himself and returned, and his father rushed out to hug and welcome him (Luke 15:18-22). This showed, very effectively, God's forgiveness and intense love for those who repent and return to serve Him.