The boy is wearing a blue shirt, and the girl is wearing black clothes.
The children are dressed for church.
Just because a boy and a girl are wearing clothes doesn't mean they are necessarily dressed for church.
exists e1 e2 s1 s2 x1 x2 x3 x4.(n_girl(x3) & n_boy(x1) & Theme(e2,x4) & Actor(e2,x3) & v_wear(e2) & n_clothes(x4) & a_black(s2) & Theme(s2,x4) & Theme(e1,x2) & Actor(e1,x1) & v_wear(e1) & n_shirt(x2) & a_blue(s1) & Theme(s1,x2))
exists e1 x1 x2.(n_child(x1) & for(e1,x2) & n_church(x2) & Theme(e1,x1) & v_dress(e1))