The narcissistic family tree. In healthy families, we encourage our children to be loving & close to each other. In narcissistic families, children are pitted against each other & taught competition. There is a constant comparison of who is doing better & who is not. Some children are favored or seen as the golden child & others become the scape-goat for the parents projected negative feelings. Siblings in narcissistic families rarely grow up feeling emotionally connected to each other.
People use this as a way to explain how wrapped up Loki is in his own insecurity that he fails to see how his family loves him. Frankly, if I were Loki, I wouldn't believe them either. Especially Odin and Thor.