Inner city brothers movie, one paints secretly in basement

Also, I can't remember if they're Irish but I think they are, can't remember the movie, the family lives in a low income apartment upstairs, father is an alcoholic (of course), at least two brothers, one paints in the basement in secret from his family (he wants to be an artist), at the end they go to a theater where the one works for some criminal guy who runs the theater and they rob him, or at least hurt him, I think the one brother gets beat up really bad maybe to death so the other one can get away and rob them, a riot breaks out or something.... it's set sometime between I'd say the 50's and the 70's, and three quarters through the movie the painters mother goes downstairs and discovers what he does down there.

PLEASE HELP

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"so i turned away, because i didn't want to see. just like everybody else."

"If dreams are like movies then memories are films about ghosts"

Some of your description checks out for the movie "Sons And Lovers" from 1960 where the father is an alcoholic, one son paints, and at one stage is beaten up by a jealous husband. It's probably not what your looking for but I thought I'd mention it just in case.