The dressed up young people are sitting in chairs while they wait.
They are waiting for their parents to finish conversing.
You can not infer they are waiting for parents.
exists e1 e2 p1 s1 x1 x2.(n_thing(x1) & n_people(x1) & a_young(s1) & Theme(s1,x1) & r_up(x1) & Theme(e1,x1) & v_dress(e1) & exists e3.(Actor(e3,x1) & v_wait(e3)) & while(e2,p1) & in(e2,x2) & n_chair(x2) & Actor(e2,x1) & v_sit(e2))
exists e1 p1 x1 x2.(n_parent(x2) & of(x2,x1) & n_thing(x1) & n_thing(x1) & Topic(e1,p1) & exists e2 x3.(Theme(e2,x3) & Actor(e2,x1) & v_finish(e2) & n_conversing(x3)) & for(e1,x2) & Actor(e1,x1) & v_wait(e1))