I thought it was confirmed by the writers that Henry is the boy the seer prophesised about?
Tamara has to have some form of relationship with magic, enough to believe that it is real and exists in a world that considers it to be fiction. Why else would she travel round the world trying to find it?
I think her grandmother is significant somehow because of the picture of Tamara with her grandmother. With all the teases we’ve had about Oz this season, I wonder if Tamara’s grandmother may have some connection to Oz. Perhaps as Dorothy or maybe even one of the wicked witches who could have been banished?