"Brotherhood is problematic

 The Torah describes totally rejecting certain nations because they didn't provide provisions to the Jews when they got out of Egypt

However the Or HaChaim notes we learn that they are considered family from Moshe's message to Sichon. There is a major problem with this because it is noted in the Torah from this verse that these nations did in fact provide provisions

The possible explanation is that while these nations were in fact family and had sold provisions to the Jews - they were not happy that the Jews got out of Egypt. Instead of joyfully greeting their long lost relatives they grudgingly were willing to help but only for cash or to hire someone to curse the Jews, This lack of true family feelings was the problem