Its sad to say but once its in her hands, its hers to do with whatever she wants. I too went thru thru this when my dad died. My brother being the oldest got first pick of everything.,,, But mom was devestated to find out later he sold everything. (rifles my grandfather built, jewlery , computer , clothes etc) for drugs. It made me sick to my stomach. But it was given to him, so I bit my tongue. :(
PS..... Later (a few months) my Bro asked mom to borrow money for rent. She said no. He never talked to her again (15 yrs) til the day before she died (hospital)