A man helping a young child up to a train engine, while a woman climbs up the steps behind them.
A father is helping is young child get on a train as his wife, mother of the child climbs the steps of the train behind them
Because the man is helping the young child, he is most likely the child's father. Since the woman is directly behind them, it is probable that she is the wife of the man and mother of the child.
exists e1 p1 s1 x1 x2 x3 x4 x5 x7.(n_step(x7) & a_topic(x1) & exists e2 s2 x6.(a_up(s2) & Manner(e2,s2) & Theme(e2,x7) & Actor(e2,x6) & v_climb(e2) & behind(x7,x1) & n_woman(x6)) & n_thing(x1) & while(e1,p1) & to(e1,x4) & n_engine(x4) & of(x4,x5) & n_train(x5) & r_up(e1) & Theme(e1,x3) & Actor(e1,x2) & v_help(e1) & n_child(x3) & a_young(s1) & Theme(s1,x3) & (x1 = x2) & n_man(x1))
exists e1 e2 p1 p2 x1 x2 x3 x4 x5 x8 x9.(n_step(x9) & n_child(x8) & on(e2,x4) & as(x4,x5) & exists e3 x7.(behind(e3,x1) & Theme(e3,x9) & Actor(e3,x7) & v_climb(e3) & of(x9,x4) & of(x7,x8) & n_mother(x7)) & n_thing(x1) & n_train(x4) & n_train(x4) & that(x5,p2) & n_wife(x5) & of(x5,x1) & n_male(x1) & Actor(e2,x1) & v_get(e2) & exists s1 x6.((x3 = x6) & n_child(x6) & a_young(s1) & Theme(s1,x6)) & (x1 = x3) & Actor(e1,x2) & v_help(e1) & (x1 = x2) & n_father(x1))