My mother claims I’m in her will but refuses to show it to me. Should she put my name on the deed to her home?

Dear Quentin,

My mother is in her late 80s and owns her home outright. I have a half-brother I’ll call “Matt.” Matt has been designated my mother’s power of attorney. My mother has told me that in her will, everything will be split 50/50 between Matt and me. 

Her house is the only valuable asset. She is considering…