Do mexican girls put spells or something on their men?

my brother is dating a mexican girl and my family cant stand her only cause she talks crap about all of us and she can swear that we steal from my brother and my brother always believes her over us no matter what the case is. we all left his life and recently he came to our house for a visit and she was against it and she told my brother we called her and cussed her out calling her inappropriate names which isn't true but of course he still believed her. my brother use to love being around family and now thanks to this mexican girl he hates us......does anyone know why this is happening? why is he up her , and what does she have on him? please and thank you.