There is a family sitting outside in the shade.
People sitting outside.
[If the sentences are in the correct order, the task cannot be completed.  If the sentences are in reverse order:]  The people sitting outside are not necessarily family and are not necessarily in the shade.
exists p1 x1 x4.(n_shade(x4) & exists e1 p2 x2 x3.((x1 = x2) & in(e1,x4) & exists s1.(Theme(s1,x3) & a_outside(s1)) & Topic(e1,p2) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_family(x2)))
exists e1 p1 x1 x2.(a_topic(x1) & exists s1.(Theme(s1,x2) & a_outside(s1)) & Topic(e1,p1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))