Reigns and Rikishi are first cousins even though WWE says Rikiki is Roman's uncle. Reigns's dad is Sika of the Wild Samoans. Rikishi's mother was Sika's sister. Yokozuna was only a first cousin of theirs. His dad was Afa ans Sika's brother. The Rock is not really a bllood relative. His grandfather was a blood brother of Afa and Sika's dad.

Rikishi and Roman are cousins. The Rock is a family friend to them, they call them "Blood Brothers".

Cousins

They are all part of the Anoa'i family

they are all part of the anoa'i family, a family tree of samoan-descendants, many of whom have been in pro wrestling (the usos, umaga, rosie, and yokozuna are all related to those three too)

They're cousins.

By being part of the same family? Isn't this common sense?

they have stage names that start with "R"

THEY ARE COUSINS