The young man in the blue shirt holds the ladder for the man in the white shirt in a graffiti-covered alley.
the guy held the ladder steady while his brother was on it
The guy holding the ladder may or may not be the other guy's brother.
exists e1 s1 s2 s3 s4 x1 x2 x3 x4.(n_shirt(x2) & n_shirt(x2) & a_white(s3) & Theme(s3,x2) & n_man(x1) & n_man(x1) & n_ladder(x3) & a_blue(s2) & Theme(s2,x2) & a_young(s1) & Theme(s1,x1) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & for(x3,x1) & in(x1,x2) & in(x1,x2) & in(x2,x4) & n_alley(x4) & a_graffiti-covered(s4) & Theme(s4,x4))
exists e1 p1 s1 x1 x2 x3 x4.(n_thing(x2) & n_brother(x4) & of(x4,x2) & n_male(x2) & n_ladder(x2) & n_guy(x1) & exists p2.on(x4,x2) & while(e1,p1) & Theme(e1,x2) & Actor(e1,x1) & v_hold(e1) & Theme(s1,x3) & a_steady(s1) & (x2 = x3))