When should a family member butt out!?

My mom died about 2 months ago, and my brother is constantly on me to move back home. I should point out that I am 41 years old, and up until recently have had a full-time job. I am a victim of the economy and am trying to get another one. I have enough to live on for now, but he seems to think that my savings will be dwindled soon, and is constantly asking me what's in my bank account. When I try to point out that it's none of his business, he gets angry and accuses me of all sorts of things, among that is that he thinks my father is going to bail me out. (Note my parents did it once after I got divorced.) But I have always been able to support myself. My father is lonely, but I am not neglecting him. I try to tell him in a nice way that it's none of his business what my money matters are, but he keeps arguing to the point where I am almost ready to move home just to shut him up.