The Pastor's Wife: Who am I? Who is He?

I'm standing in the kitchen with Joseph when I hear a deep voice in the hallway. We've been in the process of building our house and trying to get the punch list knocked, so I expect my youngest son to reply that a contractor is here fixing his bathtub. Instead, a silly grin emerges on his face, and looking at me out of the corner of his eye, he says, "Mama, that's Jacob."