A female and a male each sit on the sofa with a child.
There is a male and female sitting next to a child.
Sit on the sofa with a child means sitting next to a child.
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 p1 x1 e1 x2 x3 x4 x5 x6.((x1 = x2) & to(e1,x6) & n_child(x6) & r_next(e1) & Actor(e1,x5) & v_sit(e1) & (x2 = x5) & n_female(x4) & n_male(x3) & subset_of(x4,x2) & subset_of(x3,x2))