This is a tricky question. The correct answer likely depends upon which ancient civilization(s) you're being asked to look at. I suspect, however, that the correct answer is "A." All of the others are obviously themes in ancient stories. On the other hand, a great many stories about ancient families deal with family strife, instead of family unity. Think Oedipus, Set and Osiris, Cain and Abel. Unified families do appear in ancient stories, but I don't think that they form as much of a theme as the other answers do.
A word of caution: this answer could heavily depend upon which civilizations you're being asked to look at, and just when "early ancient" is supposed to be. The story of Oedipus that I referred to is from relatively late in the ancient world.