So far, K25 has been the continent of the family tribes for me.
I started by joining a small tribe, as everyone does when they still have one village. That tribe joined another tribe, and that tribe merged with Black!, a weak tribe with a tight cluster... Too tight. They were dominant in the northwest of K25, but only in the northwest. Aside from that they also had no less than 2 academy tribes; Blue! and White!. Needless to say, people got a bit grumpy when they got down to internal and barb nobling because there were no other options. I (one of the Black! top members... Which was nothing special by the way) and a few others then left and joined the HAW family... The only other option in this part of K25, really. Black! fell apart, as expected.
Now I'm in the HAW family. I actually have nobling options (as long as they're not claimed yet of course), which is a good thing. But it's a family tribe again. As far as family tribes go, though, this is a pretty good one. Quite a large number of people willing to support and help out in other ways, and a mix of experienced players willing to help and new players willing to learn. I won't go and claim everyone is a good player, because I simply don't know all players, but the tribal family at least has a chance.
K25 is now dominated by 2 family tribes: The Gians family and the HAW family. The only other good tribes on the continent with a decent presence (top 10) are Apathy and the one man tribe |W|.
There, my opinions. Do with them what you want ^^