Help me...!Please...

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I'm looking for the title of a movie with the following plot:
It's about 4 brothers who rob banks!
I remember that their mother told them to become bank robbers and she supported them.At the end, they get killed after a bank robbery because it took them a long time!The younger one gets killed earlier..I think.Please help me!Thank you very much!
I forgot to mention that it's not "The Newton Boys", "Four Brothers", "Trespass". I have already looked for these...

I'm not sure whether they wore masks during the bank robberies...
It seemed more like a western but not an old one..I don't know how to explain this..Their mother told them to become bank robbers and she advised them a lot.When her youngest son died, she cried a lot..I remember..
I can't get this film out of my head..The end was really sad, because all of them died outside of the last bank they robbed...They were surrounded by the local police...



I am half agony, half hope.
Sounds like it might be a film based on Ma Barker. Maybe Bloody Mama? It's not very good, but I liked it. It could also be Public Enemies, which is a newer version I haven't seen.
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Thank you so much!!!!!!!!!!!!!!!!!!!!!!!!!!!!It's the Public Enemies!!!
Mrs. Darcy, you are the best!!!!
Thanks a lot!!!!
By the way, Bloody Mama has the same plot I think.
Thanks!!!!