The man is sitting with a little girl in the park.
A little girl is visiting the park with her Grandpa.
A man sitting with a little girl in a park could be a friendly stranger, a twice-removed cousin, a great uncle, a father, etc. It does not mean it is her Grandpa.
exists e1 s1 x1 x2 x3.(n_park(x3) & n_man(x1) & with(e1,x2) & in(x2,x3) & n_girl(x2) & a_little(s1) & Theme(s1,x2) & Actor(e1,x1) & v_sit(e1))
exists e1 s1 x1 x2 x3.(n_grandpa(x3) & of(x3,x2) & n_female(x2) & n_park(x2) & Theme(e1,x2) & Actor(e1,x1) & v_visit(e1) & with(x2,x3) & n_girl(x1) & a_little(s1) & Theme(s1,x1))