I Think My Siblings Trying To Cut Me Out Of Our Inheritance

This is all taking place in TN. Recently, my half siblings and I lost our grandmother (grandfather passed some year back), and it turns out she left us the house. Everyone decided to sell (without consulting me any), which is fine. Well, I signed the agree for listing. And I signed the contract for the purchase agreement. Now when I ask my sister about how much we can expect, I'm getting the cold shoulder.
I want to know what I can do to protect my share. Its roughly 5 of us that signed the agreement. I expect it should be at least $10K USD between us. What should I do here?
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