Originally Posted by Magnea
Ok when Claire was "kiddnapped" and Kate got Aaron we saw Jacks father,Christian, in Jacobs house with Claire. We all know that Jacks father is on the Island and he's also Claires' father.! So this is the question, is Christian Shephard Jacob.?
Nah... pretty sure that Christian is a manifestation of the Monster (aka Smokey). In season 5, when Sun and Frank arrive at the dock to the processing center, we hear the monster and see the trees shake. Sun says "it's probably just an animal".
Then, when Christian is showing Sun the photo, the door of the building pops open with some violence and there is a mist, or smoke, in the air inside with Sun, Frank and Christian.
Christan, as we see him walking around the island, is Smokey.