This passage appears in the RCL for Year C during Lent. (Lastly: March 31, 2022)
Summary: Like other great and familiar stories, the prodigal son does not require anything overly advanced in terms of understanding Greek. The best thing we can do is help our listeners slow down, ponder the story and dwell on its many meanings, most of which are not too secretive. But if you want something to chew on...recently I have been reflecting on how modern humans are Homo Economicus, defined by our market based relationships. This passage presents some very interesting connections between money, life and happiness. Both sons must learn that true relationships are based on compassion and grace, not the exchange of goods and services. Yet true relationships reveal themselves in exchange of goods and services.
Side note: In 2019 my church read Henri Nouwen's book, The Return of the Prodigal, based on Rembrandt's painting of this story. Excellent read!
σου (of you, vs 30). This is a little word, but it is significant (and its meaning clear in English). The older brother considers his brother only a son of the father (your son!). The father explains that it is actually his brother (your brother). Economic relationships can be severed, but blood relationships cannot (or not without some serious difficulty).
ουσιας and βιον ("estate" and "money" in vs 12). These words mean more deeply "life" or "essence." (Think: Ousia from "one ousia three hypostasis"; and bios in "biology"). It is striking that the Father is asked and gives not simply of his money, but of his essence, his life, his estate. There is a strong relationship between what the Father has and who the Father is. Both sons perceive correctly that the Father's giving away of possessions reveals something about his character. What we have to give is reflective of who we are. To think about it differently and in terms of God's gifts, to know Christ is to know Christ's benefits (as Luther said).
καλλαω ("be employed" in vs 15). This word actually means cling. (Husband shall cling to his wife). How many of us are clung to our jobs? The assumption is that the economic relationship will provide a basis for existence. But it does not. The younger son is only the hired hand (μισθιων). In fact, when he seeks to return to his father, he offers to become a hired hand, where the relationship would be simply economic between him and his father.
εσπλαγχνισθη ("compassion," vs 20). This word means, literally, intestines. The idea of Greek compassion is that when you have compassion on someone, your insides get tight. The father has compassion on the son.
παρακαλει ("encourage," 28) I think it interesting that the verb here for encourage is related to the word for Holy Spirit (paraclete). The father is encouraging the older brother. We confess in the Apostle's Creed a belief in the forgiveness of sins. This petition of faith is in the third article, which consists of things having to do with the Holy Spirit. We definitely need the Holy Spirit to enable us to forgive each other.
εις εαυτον δε ελθων ("came to himself", vs 17) The Greek is literally "under the circumstances of having come into himself, he said, "How many of the hired hands of MY father" When he went in he remembered the core identity of his father -- a generous person who claimed him as a son.
Lastly, a note on parental love for children. I grew up in a wholesome family that communicate love from the parents to the children. I have a favorable impression of parental language for God. The idea that my parents would love me no matter what helped me, I think, understand that God would love me no matter what. I realize that not everyone has this kind of love and that parental images of love may be harder for some.
As a parent of a teenager and tween, I now realize how vulnerable parental love is -- it can be rejected! I guess I had always known this. For God to claim us as children means there is a permanence in the relationship, but also an admission that it can go south; the child can leave!