A little boy in a gray shirt stands between two seated women.
A son stands between his mother and aunt.
Just because a boy stands between two seated woman,.  does not mean the women are his aunt and mother.
exists e1 e2 s1 s2 x1 x2 x3.(between(e1,x3) & n_woman(x3) & Theme(e2,x3) & v_seat(e2) & card_eq_2(x3) & Actor(e1,x1) & v_stand(e1) & in(x1,x2) & n_shirt(x2) & a_gray(s2) & Theme(s2,x2) & n_boy(x1) & a_little(s1) & Theme(s1,x1))
exists e1 x1 x2 x3 x4.(between(e1,x2) & subset_of(x4,x2) & n_aunt(x4) & subset_of(x3,x2) & n_mother(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x1) & v_stand(e1) & n_son(x1))