An adult and child dressed in full ski gear stopped on the slope.
A father and son posing right before they head back into the log cabin.
The adult and child may not be father and son.  Just because they are stopped on the slope, doesn't mean that they are going to a log cabin.
exists e2 e1 s1 x1 x2 x3 x4 x5 x6 x7.(n_slope(x7) & on(e2,x7) & Actor(e2,x1) & v_stop(e2) & in(e1,x5) & n_gear(x5) & of(x5,x6) & n_ski(x6) & a_full(s1) & Theme(s1,x5) & Theme(e1,x4) & v_dress(e1) & (x1 = x4) & n_child(x3) & n_adult(x2) & subset_of(x3,x1) & subset_of(x2,x1))
exists e1 p1 s1 x1 x2 x3 x4 x5.(n_cabin(x4) & of(x4,x5) & n_log(x5) & a_topic(s1) & subset_of(x2,s1) & r_right(e1) & exists e2 s2.(a_back(s2) & Manner(e2,s2) & into(e2,x4) & Actor(e2,x1) & v_head(e2)) & n_thing(x1) & before(e1,p1) & Actor(e1,x3) & v_pose(e1) & (x2 = x3) & n_son(x2) & subset_of(x1,s1) & n_father(x1))