A pile of dogs sleep on a blue dog bed.
The dogs are all siblings.
A pile of dogs asleep on a dog bed does not necessarily mean they are all siblings.
exists e1 s1 x1 x2 x3 x4.(on(e1,x3) & n_bed(x3) & of(x3,x4) & n_dog(x4) & a_blue(s1) & Theme(s1,x3) & Actor(e1,x1) & v_sleep(e1) & of(x1,x2) & n_dog(x2) & n_pile(x1))
exists p1 x1.(n_dog(x1) & all x2.(n_sibling(x2) -> (x1 = x2)))