Several travelers either standing or sitting on what appears to be a subway car.
children are with adults on a subway
You can not assume there are any children with the travelers who are either standing or sitting on a subway car. Several travelers could be a group of adults.
(exists e1 s1 x1.(exists e2 p1 s2 x2.(n_thing(x2) & a_either(s2) & Manner(e1,s2) & on(e1,x2) & Topic(e2,p1) & Actor(e2,x2) & v_appear(e2) & exists p2 x3 x4.((x2 = x3) & n_car(x3) & of(x3,x4) & n_subway(x4))) & Actor(e1,x1) & v_stand(e1) & n_traveler(x1) & a_several(s1) & Theme(s1,x1)) | exists e3 s3 x5.(exists e4 p3 s4 x6.(n_thing(x6) & a_either(s4) & Manner(e3,s4) & on(e3,x6) & Topic(e4,p3) & Actor(e4,x6) & v_appear(e4) & exists p4 x7 x8.((x6 = x7) & n_car(x7) & of(x7,x8) & n_subway(x8))) & Actor(e3,x5) & v_sit(e3) & n_traveler(x5) & a_several(s3) & Theme(s3,x5)))
exists p1 x1.(exists x2 x3.(with(x1,x2) & on(x2,x3) & n_subway(x3) & n_adult(x2)) & n_child(x1))