biological parents vs. adopted parents

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I have one adopted brother and actually he is the oldest among us children of our real parents. He is 5 years older than our eldest brother. He came to us when he was 14 years old. We saved him from a poor family who doesn't have the means to suppoort his food and education. he knew all along that he was just adopted. Now, he is a nurse in Norway and his wife too and is now living a very good life. His biological parents and siblings tough were still in the same situation. Hardly had anything to eat, hardly had any money to support the education of their children. Life in Norway has not been easy for him. he struggled at first so he did not have much to give his family for the first few years and he also had his own family there in Norway. Time passed and everything went fine for him. Now he's well off and has a lot to give and help his real parents and relatives with but it was our parents whom he favors more. It is our parents whom he gives gifts and money to. He helps his relatives of course but only when they "BEG" for his help and he gives only when he thinks that they really need help.He said so himself that if there's someone who deserves his favor and his affection, it would be his adopted parents who helped him to be where he is now. This situation made the rest of his blood relatives angry at us. What is your opinion about this situation? What do you think should be done?