Three people on a porch, of which is a little boy who is sitting up straight in his chair.
Two people are the boy's parents enjoying the porch.
There is nothing about the people including a boy on the porch that implies any relationship, such as that the two others are the boy's parents, or implies the mood of the parents, such as enjoying being on the porch.
exists p1 x1 x2 x3 x4 x7.(exists e1 s1 s2 x5 x6.((x3 = x5) & r_straight(e1) & in(e1,x7) & a_up(s2) & Manner(e1,s2) & Actor(e1,x6) & v_sit(e1) & (x5 = x6) & n_boy(x5) & a_little(s1) & Theme(s1,x5)) & n_chair(x7) & of(x7,x1) & n_male(x1) & of(x3,x2) & on(x3,x4) & n_porch(x4) & n_people(x3) & card_eq_3(x3) & n_thing(x1) & (x1 = x2))
exists p1 x1 x2 x3 x5.(n_porch(x5) & n_parent(x3) & of(x3,x2) & n_boy(x2) & exists e1 x4.((x1 = x3) & Theme(e1,x5) & Actor(e1,x4) & v_enjoy(e1) & (x3 = x4)) & n_people(x1) & card_eq_2(x1))