Mom passed leaving house to brother who lived there. Does it include all property of hers in house? What about financial accests in accounts.

Brother says everything in the house that was Mom's is now his. Said he is waiting for after taxes (passed last Feb) before distributing funds. Even thought he is spending those funds. What are our siblings rights to items in house, financial accounts left. Brother said that will has been filed, how to find out where and get a copy? Brother knew about the written paper and what it contained. It had been changed several times. No date on when it was written. She ended up with Dementia. Wondering if he had influence on the writing of it and the changes that were in it. One other sister knew about the paper will and what it contained before Mom passes.