My Mom and Grandparents always Yell at me?

Ok so a few years ago my Parents got Divorced and my Grandparents got me and my mom new House 500,000 dollars I have a reason for telling you that listen. So they get me nice clothes. Nice things. New iPhone everything. My grandpa had a really good job BTW him and my grandma live in a huge house. They have nice cars. They Got my Mom two Cars A BMW X5 and a Acura Tlx about a year ago. They get me all these Bikes and things. BUT HERE IS THE THING I don't just care about all that stuff because it's not Love they also always make fun of my dad and my other side of my family they say bad things about them and stuff they always yell at me for not talking when we go out and I don't talk only because I'm so nerves around them. My dad is only one who is nice to me. And they always make fun of him and say he's bad guy BTW I see them A lot my Mom never tells them to Stop. ALSO MY MOM LIES TO ME ALOT AND WHEN I CONFRONT HER ABOUT IT SHE CALLS MY GRANDPARENTS THEY START SAYING THINGS LIKE WE'RE NOT GONNA GET HIM STUFF ANYMORE. MY MOM ALWAYS YELLS AT ME SOMETIMES I JUST SIT IN MY OFFICE IN MY HOUSE AND CRY. Any help thanks.

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