There could be many reasons for this behavior. It could be that the mother is experiencing stress or negative emotions that are affecting her behavior towards the child. It could also be that she has unrealistic expectations for the child or has difficulty expressing love and affection. Additionally, there could be a history of conflict or past experiences that are influencing the mother's behavior. As for the brother being nicer, it could be that he has a different relationship with the child or that he is more understanding and patient. Ultimately, it is important for the mother to seek help and support in order to improve her relationship with her child.
