Luke 15 pt. 2 The Parable of the Prodigal, The Brother, and The Father

Often we see this parable in a one sided way and that's from the prodigal son's perspective. Sometimes we go on further and see the father, which we liken to God and the way he takes us back after we have disgraced Him. But what about the prodigal's brother? What was Jesus teaching us about the brother in this parable and how it applies to us?