A boy crawls through a rock tunnel with his brother and father behind him.
A boy's brother and father are following him.
If the people are behind him, then they are following him.
exists e1 x1 x2 x3 x4 x5 x6.(through(e1,x2) & subset_of(x6,x2) & behind(x6,x1) & n_male(x1) & n_male(x1) & n_father(x6) & subset_of(x3,x2) & with(x3,x5) & n_brother(x5) & of(x5,x1) & n_tunnel(x3) & of(x3,x4) & n_rock(x4) & Actor(e1,x1) & v_crawl(e1) & n_boy(x1))
exists e1 x1 x2 x3 x4.(Theme(e1,x1) & Actor(e1,x2) & v_follow(e1) & n_male(x1) & n_father(x4) & n_brother(x3) & subset_of(x4,x2) & subset_of(x3,x2) & of(x2,x1) & n_boy(x1))