A parent is brushing their child's teeth.
The child is having their teeth brushed.
If someone is brushing a child's teeth, then the child is having their teeth brushed.
exists e1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_brush(e1) & n_tooth(x3) & of(x3,x2) & n_child(x2) & of(x2,x1) & n_thing(x1) & n_parent(x1))
exists e1 e2 x1 x2 x3.(n_tooth(x2) & of(x2,x1) & n_thing(x1) & n_child(x1) & Theme(e2,x2) & Actor(e2,x1) & v_have(e2) & Theme(e1,x3) & v_brush(e1) & (x2 = x3))