My aunt, who's executor of the estate, won't give me my share of inheritance. How do I claim it & what type of lawyer will I need to hire to help me?

how do i claim my inheritance when my aunt, who is executor of the estate, wont give me it? Also, what type of lawyer will I need to hire & What area of law should I google/research? My aunt is the executor of the estate but Im not entirely sure if shes the executor of the family Trust or will. Im 1 of 5 people (*my aunt, my uncle, my Dad, my sister and 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 never even tried contacting me about this. My aunt has never liked me and believes that Im 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 has handled everything so far