Isaac looks a little more like Hannah than I thought. My mom pointed out that this picture of him reminded her of Hannah's smile.
So I dug into the Smith archives and came up with these two pictures of Hannah. What do you think?
(This was Hannah's weird hair phase when the dark curly hair was falling out and the blonde was starting to grow in.)
I still think when his eyes are closed he looks a lot like Genna, but I too was starting to see the similarity in Hannah and his smiles.