[KinKi] The Domoto connection

I'm sure I'm not alone. Domoto Koichi and Domoto Tsuyoshi. Domoto sounds not common in Japanese. I always thought that Johnny-san must have a sixth sense. SMAP, Tokio, V6, KinKi Kids, Arashi and Kanjani8 are the prove. How come he can figure, what did he saw on those kids till they can reach this high?
As for KinKi, it supposed to be the name they carried, Domoto. Is it a name for Kansai people?
Anyway, I remember from the last show, 'Aura no Izumi' (14 July 2007) where Koichi was the guest. There's a talk about the bonding between both Domoto. One of the host, said that their bond cames from their ancestors who helped each other in the past. That's why they can understand each other without saying it. Well, sort of. Sorry, coz I can't repost the translation here. In few interviews, both admit it too. That their relationship is more than a brother nor friends and they knew each other thought without saying it.

Anyway, I rewatch Utaban 2006.11.30 and note this.
Apparently they also connected in this way..

Koichi's father x Tsuyo's father = Mitsugu x Mitsuo
Koichi's mom x Tsuyo's mom = Kiyoko x Youko
Koichi's sister x Tsuyo's sister = Megumi x Nozomi
and then Koichi x Tsuyoshi XD


the pic on the left above is from Aura no Izumi.