Well, getting together for meals or to be photographed is not teamwork. It usually more ritual than anything else.
True "teamwork" is pulling together personalities, strengths, weaknesses and accomplishing something where the net result is greater than the sum of the parts. There is more than a bit of a need to set oneself aside for the good of others in the team.
I agree that the family defers to elders. And that they vaguely support one another. And that they all hold the good of the family as a top priority. But the greatest challenge for any team with a lot of strong willed persons in it, or where there is a given pecking order, is to set that aside. I imagine being the team building consultant for this family, and frankly, I break down into giggles.
Anyway, off topic.