how do i claim my inheritance when my aunt, who is executor of the estate, won't give me it

My aunt is the executor of the estate but I'm not entirely sure if she's the executor of the family Trust or will. I'm 1 of 5 people (*my aunt, my uncle, my Dad, my sister & myself*) on my grandparents last will and testament. Everything was supposed to be split equally 5 ways, which has not happened. I heard from my Dad that my grandparents house was sold back in March 2015 for $340,000. My aunt who's executor of the estate, never even tried contacting me about this. My aunt has never liked me and believes that I am undeserving of my share of the inheritance. I need help with getting what is owed to me. I was raised by my grandparents they were like my mom and my dad. And I know if they were still alive they would be furious with my aunt because of what she is doing to me and how she is handling the situation