A female and a male each sit on the sofa with a child.
man, woman, and child on couch
If you are on the sofa then you can be on a couch
exists e1 x1 x2 x3 x4.(n_sofa(x3) & with(e1,x4) & n_child(x4) & on(e1,x3) & Actor(e1,x1) & v_sit(e1) & all x6 x5.(((x5 = x6) & n_male(x6)) -> subset_of(x5,x1)) & subset_of(x2,x1) & n_female(x2))
exists x1 x2 x3 x4 x5.(a_topic(x1) & rel(x1,x2) & subset_of(x4,x2) & on(x4,x5) & n_couch(x5) & n_child(x4) & subset_of(x3,x2) & n_woman(x3) & n_man(x1))