My parents live with my brother and his family. Due to unforeseen circumstances they cannot live elsewhere. My parents were both high achievers and medical professionals.
My brother constantly argues with dad and tries to correct him and tells him off. My father is very intelligent and was a leader in his job. He is still knowledgeable but when he discusses anything, my brother will try to negate him and tell him off, sometimes bordering on rudeness.
Dad is still very well read and knows a lot on several topics. He speaks authoritatively and is mostly correct. I cannot say anything to my brother as I don’t want there to be a problem in their family. How do I say to my brother that dad is hurting? What do I do? Mom will never say anything. She used to be close to my brother. Now she just watches TV all day.