The Anoa'i Family Tree is extremely complex and deeply rooted within the depths of wrestling history, and both The Rock and Roman Reigns are a part of that tree – despite not being blood-related, which is something many people overlook when thinking about wrestling's strongest "Bloodline." High Chief Peter Maivia, The Rock's grandfather by adoption, and Reverend Amituana'i Anoa'i, Reigns' grandfather, sit atop the family tree. While not related by blood, the Maivia and Anoa'i families were extremely close, enough to take part in a blood oath pact, bonding them as blood brothers and uniting their families. Rock's mother, Ata Johnson, was adopted by Maivia when she was younger. 

While Reigns and Johnson may not be related by blood, their bond as cousins by ancestral blood oath is strong. With WWE storyline possibly mirroring real life, Johnson crowned Reigns with the familial ula fala, initially given to the younger family member by his late father, Sika, following Reigns' victory over cousin Solo Sikoa in a Tribal Combat Match.