Should I just tell my mom how upset I am, because I thought she was going to pass all her jewelry to me one day
Why do you expect to her to leave you all the jewelry.
I thought she was giving it all to me but now I think she is splitting it equally with my sister in law.
Unless she brings it up talking about your inheritance seems greedy. She is an adult and can make her own decisions about who to leave her things to.
I'm just joking about it. She doesn't have any nice jewelry anyway.
I don't think it's wise to make jokes about what you expect to inherit either. Your mother will probably feel hurt that you're keeping tabs on her things in anticipation of her death, even if you are joking about it. I'm sure you wouldn't want your mother to feel unwanted like that.