Man and child walking along the beach in the water.
A dad and his son are skipping rocks at the beach.
Not all men are fathers. Not all children are sons. Walking on the beach doesn't necessarily imply skipping rocks.
exists s1 x1 x2 x3 x4 x5.(n_water(x5) & n_beach(x4) & a_topic(s1) & along(s1,x4) & in(x4,x5) & n_walking(x2) & of(x2,x3) & n_child(x3) & n_man(x1) & subset_of(x2,s1) & subset_of(x1,s1))
exists e1 x1 x2 x3 x4 x5.(n_beach(x5) & at(e1,x5) & Theme(e1,x4) & Actor(e1,x1) & v_skip(e1) & n_rock(x4) & subset_of(x3,x1) & n_son(x3) & of(x3,x2) & n_male(x2) & subset_of(x2,x1) & n_dad(x2))