Perhaps you know of the term
gaslighting?
Quote:
Gaslighting or gas-lighting is a form of mental abuse in which information is twisted or spun, selectively omitted to favor the abuser, or false information is presented with the intent of making victims doubt their own memory, perception, and sanity.
(Wikipedia)
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How likely is it that your brother would participate in gaslighting you so as to harm your mother or protect your stepfather?