Question: John Will completed his blackbelt under one of these men, a brother renowned for his BJJ skills?
Sentence (from "John Will"): Will also completed his black belt in Brazilian Jiu Jitsu under Rigan Machado and his brothers, John, Roger and Jean Jacques Machado in 1997; making him one of the first twelve foreign nationals to have earned a black belt in Brazilian Jiu Jitsu.
Relevant evidence: Yes