The man in the yellow jacket is cooking over an open fire as the little boy watches.
The family is on a camping trip, and cooking dinner.
Not all men and a boy are family.  Cooking does not imply it is dinner.
exists e1 s1 s2 s3 x1 x2 x3 x4 x5.(n_watch(x4) & of(x4,x5) & n_boy(x5) & a_little(s3) & Theme(s3,x4) & n_jacket(x2) & a_yellow(s1) & Theme(s1,x2) & n_man(x1) & over(e1,x3) & as(x3,x4) & n_fire(x3) & a_open(s2) & Theme(s2,x3) & Actor(e1,x1) & v_cook(e1) & in(x1,x2))
exists p1 x1.(n_family(x1) & exists s1 x2 x3 x4 x5.(on(x1,x2) & subset_of(x5,x2) & n_dinner(x5) & a_cooking(s1) & Theme(s1,x5) & subset_of(x3,x2) & n_trip(x3) & of(x3,x4) & n_camping(x4)))