A grandma holds her grandson's hand at a train stop.
Grandma and grandson.
There is nothing in "Grandma and grandson" that cannot be inferred.
exists e1 x1 x2 x3 x4 x5.(at(e1,x4) & n_stop(x4) & of(x4,x5) & n_train(x5) & Theme(e1,x3) & Actor(e1,x1) & v_hold(e1) & n_hand(x3) & of(x3,x2) & n_grandson(x2) & of(x2,x1) & n_female(x1) & n_grandma(x1))
exists s1 x1 x2.(ne_geo_grandma(x1) & a_topic(s1) & subset_of(x2,s1) & n_grandson(x2) & subset_of(x1,s1))