Newcastle Knights trio Chanel, Pat and Sione Mata'utia have re-signed with the club for an additional three years, the club announced on Thursday.
The new deal sees the trio remain at the Knights until at least the end of season 2018.
"As we have said all along, our priority is to retain our best young local talent," Knights CEO Matt Gidley said.
"In addition to the boys' rugby league talents, they are outstanding young men from a wonderful family, which is very important from our club's point of view.
"By re-signing the three brothers, we show we have and will continue to work hard on retaining our best young juniors."