Luke 15.

28 "The older brother became angry and refused to go in. So his father went out and pleaded with him."

This older brother must be really angry. He despises the action his younger brother did and therefore dislikes him. Because he left home in a very rude way by taking all the share of estate that was for him, before his father died. Not only for this action but also for the things on what the little brother spends the money on must made the older brother feeling unpleasant. And in the end he got angry because it was unbearable for him to see this person who did all these things coming back and being welcomed with so much warmth by their father. His reaction is very natural and we would expect this attitude also for the father. Actually the little son hurts the father the most. It was an issue between the father and the little son. The older son has nothing directly to do with it. Maybe he could accept it if his younger brother went home and the father quietly welcome this son. But this son was welcomed with a big celebration the best things were brought out. In the eyes of the older son this special treatment for such an undeserving person is just unacceptable. He himself never were treated that special and in this way. How can he be happy and celebrate with all the others? Because he felt being insulted with this celebration he wanted to isolate himself and stay away from that joyful crowed of people.
But in this angry mood and unwillingness to accept this brother, just when he wanted to turn around and leave his father came to him and pleaded with him. In this action of the father we can see that he does care for the older brother too. He was not forgotten even if everyone was busy with this celebration. The father also wants his older son to be happy with him and not that he isolates himself. But the older son at first do not want to follow him, instead he accuses his brother for being bad and his father for being unfair. The father did not directly explain and answer him but he pointed out that his little brother was dead and now is alive. It is as if he wants to ask and tell the older son: "Do you also want to come back home after looking after for pig because you have no money and to be in such a bad condition, dirty and hungry? Do you want to experience the feeling to regret for what you done and that everything turned out so bad was your own fault and that there is no one to blame for? And than shamefully come back home? Do you want to go through everything he went through only to receive the same special treatment? You were here all the time and you lived a good live. You had me (the father) and everything i own. Is it not enough that I cared for you all the time? Be happy with everyone because your little brother was able to bring up the courage to humble himself. He even suggested not to accept him as son but to receive him as a servant. But I want him as a son because he is my son. Therefore my son be with us together and be happy."