He broke down when he was reading one of his messages implying that he was feeling suicidal. When he began to talk about his family, the tears stopped and he quickly regained his composure. That's why I think the emotion was real-- he was feeling pain and sorrow for himself. When it came time to acknowledge his family, his emotions dried up and he got back on track.
You will notice how frequently he uses his family as a club to attack his critics with. How many times has he tried to make the point that his detractors are not concerned about his family? His wife and children are useful insofar as he can use them to pretend to be a caring family man and insofar as he can use them to distract his critics. But I don't think he really cares about them, certainly not as much as he cares about himself.