God's Prodigal Family: Father (Luke 15:11-32 (LD 51)

It is easy to judge the younger brother and to let him live with the consequences of his actions.  It might be touching to think that the father still hosts the banquet for the younger brother.  You can almost have a sentimental feeling that the father is a really good father.  The parable hits home when the father explains to the older brother why this banquet is so significant.  It also hits home when the father has to pursue the lost son.  Which son is really the lost son in this parable?  What is the significance of the father going out to meet with each of the sons?