Mom just passed away on May 2, 2019. My sister and my uncle were beneficaries of her life insurance policy. I don't know what to do.

Can she tell me I can't have 2 small urns of my moms ashes as well as tell me I get nothing from my mom cause we didnt see eye to eye? I wanted the urns for my sons which are too young to remember any of this. Yet my uncle that lived with her was already packing her stuff up and throwing it outside and in garbage can. There was no will and I still get told no I cant have anything of my moms yet my uncle has her car and won't give it to no one. I dont know what to do besides file a informal probate, then request all property to be returned and file theft charges against those it dont return any of her stuff they took........ I am clueless as to how to handle all the crap people are talking let alone all the other stuff I am going thru right now in my life.