The prodigal son is a lesson that not too many churches teach or believe in today.
It is a lesson in assurance.
God took for himself the name of "Father" so we could some how relate to Him. (Isa 55:8)
A Father can never say that a son or a daughter is not His.(Gal 4:6)and (Rom 8:14-17)
The father can write that person out of his will or kick him out of the house or correct him by discplinary measures (Proverbs 3: 11-12), but the child will always be the child of that Father.
Once you are born again (John chapeter 3 teaches one how to be born again) You can never "not be a child of God".
The world constantly misqoutes the Bible by saying "we are all God's children."Galatians 3:26 is often quoted without the second part of this verse.
Gal 3:26 "For ye are all the children of God by faith in Christ Jesus."
We Christians should correct them and say we are all God's creation but you don't become a child of God until you are born again.
1Pe 1:23 "Being born again, not of corruptible seed, but of incorruptible, by the word of God, which liveth and abideth forever." You see when you are born again it is forever.
The lesson in the prodigal son is that no matter how bad one acts (Thank GOD that this is true) you or I will never be disowned by the Father.