I have cared for my mother in my home for the last 4 1/2 years. I have three other siblings two of which have been very supportive of me. My sister resents the fact that my mom chose to live with me and not her. I am do not want a lot of things but feel I should have first choice, What are my rights?
None! Unless specifically in the will or if you are executor/executrix there is nothing you can do. With siblings and one holding animosity it will turn ugly. If Mom isn't too far gone, ask her for those small things now. Ask for them as a birthday gift or one time gift. This will raise some eyebrows but unless you are executor who has the rights to divvy up the estate per the will, and what ever is not specifically mentioned, even though you have taken care of her for so long, you have no rights. It's up to the executor.
If your sister is already resentful, then you had better get something in writing quickly, or risk disappointment later when you find out that you have no "rights".
Have you found it and read it?
What does the will say and who is the person who executes the will?
If there is not a will, then it will go to probate court and the state will decide who gets what.