Originally Posted by SemperFideles

Is this not the very condemnation of Galatians that the Judaizing Pharisees do not embrace the Promise that Abraham had 400 years prior to the Law and substitute their idea of Torah keeping for the Promise itself?

I'm not trying to read too much into this passage but, just remember, the father isn't dead yet. The inheritance is still a hope for the older brother and not a reality. Everything that the father owns is technically the elder brother's at this point. In fact, the Parable ends mid-story before the elder brother has decided what he's going to do.