The fourth generation is
Naruto
father, and Naruto is the son of the fourth generation. There is no doubt about this. In addition, Naruto's mother is the daughter of the third generation and a member of Akatsuki, codenamed "Tama Girl", ranking eighth. The fourth generation is the leader.
The leader of the Akatsuki organization
is indeed called
Uzumaki Akatsuki
, but he is not
The Fourth Hokage
He is the younger brother of the Fourth Hokage. The name of the Fourth Hokage is Uzumaki Akatsuki.