A woman sits with a child, reading a big blue book.
A mother reads a book to her child.
A woman is not always  mother, just because a woman sits with a child does not make it her child and she can read the book without reading the child the book.
exists e2 e1 s1 s2 x1 x2 x3.(for(e1,e2) & Theme(e2,x3) & Actor(e2,x1) & v_read(e2) & n_book(x3) & a_blue(s2) & Theme(s2,x3) & a_big(s1) & Theme(s1,x3) & with(e1,x2) & n_child(x2) & Actor(e1,x1) & v_sit(e1) & n_woman(x1))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_read(e1) & to(x2,x3) & n_child(x3) & of(x3,x1) & n_female(x1) & n_book(x2) & n_mother(x1))