Several men dressed in white and red and building sand castles at the beach.
The men are brothers.
Sentence 1 is missing men are brothers
exists e1 e2 s1 s2 s3 x1 x2 x3 x4 x5.(n_beach(x5) & at(e2,x5) & Actor(e2,x1) & v_castle(e2) & in(e1,x3) & n_sand(x3) & of(x3,x4) & n_building(x4) & a_red(s3) & Theme(s3,x3) & a_white(s2) & Theme(s2,x3) & Theme(e1,x2) & v_dress(e1) & (x1 = x2) & n_man(x1) & a_several(s1) & Theme(s1,x1))
exists p1 x1.(n_man(x1) & exists x2.((x1 = x2) & n_brother(x2)))