Sumiyoshi-kai (住吉会?) The Sumiyoshi-rengo is the second largest yakuza family, with 20,000 members divided into 277 clans. The Sumiyoshi-kai, as it is sometimes called, is a confederation of smaller yakuza groups. It functions like a federation. The chain of command is more lax, and although Shigeo Nishiguchi is always the supreme oyabun, its leadership is distributed among several other people.