Stolen inheritance money?

Long story short someone either fraudulently changed my grandfathers will or my mother stole my inheritance.. Should I just get a lawyer and do it myself or should I straight up ask my grandmother what’s going on. The last thing I want to do is come off entitled but my grandfather told me his wishes way before he was sick and after he was sick. It’s no way with the relationship him and I had all that was left to me was a watch. Even if it was only 5k or something that’s money that I really need and it’ll help me since I’m in the process of moving to Miami.

Stolen inheritance money?
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