The child and his parents are sharing lunch.
Three people are eating together.
A child and two parents are three people.
exists e1 x1 x2 x3 x4.(n_parent(x3) & of(x3,x2) & n_male(x2) & n_child(x2) & Theme(e1,x4) & Actor(e1,x1) & v_share(e1) & n_lunch(x4) & subset_of(x3,x1) & subset_of(x2,x1))
exists e1 p1 x1.(exists s1.(Theme(s1,x1) & a_together(s1)) & Topic(e1,p1) & Actor(e1,x1) & v_eat(e1) & n_people(x1) & card_eq_3(x1))