Christians only please- what is your view of the prodigal son's brother?

It shows that the Lord Jesus wants to FREELY forgive everyone that believes in Jesus for salvation, no matter what they've done wrong, and others should not be bothered by that. Because they are sinners too, the brother is also a sinner. The Lord Jesus loves to FREELY give us all things by His grace, not dependent on whether we're "good" or not. Because if it were dependent on that, then it would be a denial of the Lord's grace.