>> so, where we're standing would've been jesus' ancestral home from the family of joseph. >> yes, from the family of joseph. so, although we know that he grew up in nazareth, we know from stories that there were relatives in this area, that there was an ancestral home -- he was of the family of david. the wonderful thing about the church of the nativity is that this tradition goes back to the second century, when the local people remembered where the families lived. [ soft music plays, woman vocalizing ] >> claire pfann has celebrated christmas at the church of the nativity many times over the past 30 years. >> so, in the fourth century, queen helena came. she conferred with the local christians to ask about the traditions of jesus' birth. they agreed that this was the place that the family had lived and that the birth had taken place. >> constantine, the first roman emperor to become a christian,