A check
Your brother tells you that you are being hard on your mother and that he has never seen her do any of what you describe. On this lesson, what is the most accurate reading of that?
He is lying to protect herHe is probably telling the truth about what he has seen, and that does not tell you what happened to youYou should set out the whole history to him so that he understandsHe is right and you have been exaggerating
Yes
Siblings genuinely get different versions of the same parent, so he can be honest and you can be accurate at the same time. Setting out the whole history to him is the explaining step again, and it usually ends with you defending a case rather than being believed. You do not need him to agree in order to shorten a visit.