So Upset

My grandma passed and the last couple of days we have been having memorial services for her and my family has been getting together. I'm upset with losing my grandma, as many things we did together made me the person I am today. My aunt came in to pick up her stuff that was left to her. For years, my grandma told me that she gets a set of dishes, I get next choice, and my stepmom gets last. My stepmom said she knew she was getting a set but told me in secret I could keep them, as my grandma and her never got along. My stepmom added that my dad even told her she was getting a set just a couple days ago. My aunt came in and took all of the sets, out of spite. My dad wouldn't stop her and even said he knew nothing of my stepmom and me getting a set. The whole time my aunt was verbally attacking me and accusing me of taking things. She even went as far as saying my grandma never trusted me with her items. I was so upset, I couldn't stop crying for a couple of hours. Come to find out, all this was over a violin my grandma gave me 15+ years ago. My aunt claims it was hers and it wasn't for my grandma to give. My aunt never played the violin, but I did. My thought on this was, if this was hers, why did she not have the violin before? She's been out living her life for over 40 years, and now she wants it? There's no proof that it belonged to her, or that she received it after my grandma passed. Am I wrong for standing my ground and keeping it, since it was a gift to me, or should I have returned it?