The intended meaning of that parable is made obvious when one traces out the flow or recurrent pattern of His thought throughout prior to; during; and after; said parable.
The Father in that parable represents the God of their fathers - the God of Abraham; Isaac; and Jacob: the LORD God of Israel.
The Prodigal Son represents the every day people of their nation who had turned from the LORD God of their fathers to live as they pleased.
He often defends them as sinners the others of their nation have concluded themselves better than.
The Elder Son represents both the Elders of Israel: the Scribes and the Pharisees; and those of that nation who ignorantly sided with their hypocrisy.
Those, He often rebukes.
Read chapters 11 thru 19.
You have the Daughters of Abraham...
Luke 13:16 And ought not this woman, being a daughter of Abraham, whom Satan hath bound, lo, these eighteen years, be loosed from this bond on the sabbath day?
And the Scribes and the Pharisees and those after their kind...
Luke 16:31 And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.
And the Sons of Abraham...
Luke 19:9 And Jesus said unto him, This day is salvation come to this house, forsomuch as he also is a son of Abraham.
This...is the flow or recurrent pattern of His thought...throughout.
The thing to do is to get a grasp of the overall flow of thought, in contrast to going by one word; phrase; passage; or even an entire chapter.
Those who basically violate this basic study approach principle; well, there is not much hope of reasoning with such.
Having broken from the overall flow of thought of a thing, and ended up in their own; such will simply be unable to see the otherwise obvious.
Acts 17: 11, 12.
You are reading into the text what you will it to say: it does not say what you will it to say, for the Pharisees, Sadducees, Herodians, Scribes, and "their kind" obviously did not keep all of the commandments of the Father. There is only ONE who never transgressed any commandment of the Father. Here it is again, and if you do not abide by what it strictly says you end up in the ditch:
Luke 15:25-31 ASV
25 Now his elder son was in the field: and as he came and drew nigh to the house, he heard music and dancing.
26 And he called to him one of the servants, and inquired what these things might be.
27 And he said unto him, Thy brother is come; and thy father hath killed the fatted calf, because he hath received him safe and sound.
28 But he was angry, and would not go in: and his father came out, and entreated him.
29 But he answered and said to his father, Lo, these many years do I serve thee, and I never transgressed a commandment of thine; and yet thou never gavest me a kid, that I might make merry with my friends:
30 but when this thy son came, who hath devoured thy living with harlots, thou killedst for him the fatted calf.
31 And he said unto him, Son, thou art ever with me, and all that is mine is thine.
Again:
1) There is only ONE who never broke or transgressed any commandment of the Father.
The Master makes it very plain throughout the Gospel accounts that it surely is not the Pharisees, Sadducees, Herodians, Scribes, or rulers of the people of which or whom he speaks because he calls them out continually with words like "hypocrite" and so on.
2) There is only ONE of whom it is ever said the all things of the Father are likewise his.
This again cannot be the Pharisees, Sadducees, Herodians, Scribes, or rulers of the people: have you never read about what happened in 70AD? Surely you have! It is rather the Son of whom it is said that all things of the Father are also his, (Luk15:31, Jhn16:15).
John 16:15 ASV
15 All things whatsoever the Father hath are mine: therefore said I, that he taketh of mine, and shall declare it unto you.
You cannot proceed any further into the depth of these things if you refuse to force yourself to comply with these two very simple facts, (which is why I laid them out the way I did), for otherwise you too are simply making up your own meaning for the parable to suit what you wish to believe but which does not agree with the scripture. According to your understanding the Father gave all that is His to the Pharisees, Scribes, and Elders of the people, because they kept all of His commandments and never transgressed any one of them, (lol).
It appears you need to get some new and improved study principles. :chuckle: