I think that Emmett would be the perfect brother-like figure ever! I mean; I would do anything to be in her place if that happened! Emmett is just a cute cuddly teddy медведь that always makes me laugh and cheers me up (:
He would treat her like he would his own kids. Make her laugh, and when she got older, mess with her a lot and make sure no one hurts her. He would be her Избранное uncle and be the one she could tell stuff to.