My whole family is stupid?

I do hate my mother and that’s something that can never change but my grandma is also troublesome. She would rather listen to other family members about bills (mind you they are telling her the WRONG THINGG) than me!? she’s so stubborn it pisses me off sometimes like yes she’s vulnerable but she’s also not the sharpest in the tool box. I’ll even try to explain to her in a simpler format but she seriously doesn’t take it in. She hears what she wants to hear. She will then go and cry because she only believes what the family members told her and think everything is wrong when it isn’t.