A man and a woman pose in the snow with four children.
A family on vacation is posing in the snow.
A man, woman, and children together in a photo do not have to be a family.  A group photo does not mean the group is on vacation.
exists e1 x1 x2 x3 x4 x5.(n_snow(x4) & with(e1,x5) & n_child(x5) & card_eq_4(x5) & in(e1,x4) & Actor(e1,x1) & v_pose(e1) & subset_of(x3,x1) & n_woman(x3) & subset_of(x2,x1) & n_man(x2))
exists e1 x1 x2 x3.(n_snow(x3) & in(e1,x3) & Actor(e1,x1) & v_pose(e1) & on(x1,x2) & n_vacation(x2) & n_family(x1))