Wests Tigers have locked Sione Fainu into a fresh three-year deal that will keep him at the club beyond the 2026 season.
The 24-year-old joins brothers Latu and Samuela, who are contracted through 2027, meaning all three Fainu siblings will remain at the club for at least two more seasons.
The trio, who came through the Manly juniors, are expected to be key pieces in Benji Marshall's rebuild of the long-time strugglers.
Sione has become a regular option in the middle rotation and can also slot into the second row when required.
He appeared in all 24 games during the Tigers' improved 2025 campaign, which served as his breakout season.
"The Tigers gave me a chance to make my NRL debut and start my career, I'm grateful to Benji and everyone who has supported me," Fainu said.
"I've learnt so much being part of this group and playing alongside some amazing players.
"The chance to share this experience with my brothers is really special and I'm looking forward to this season."
Latu is viewed as a potential long-term halfback but is currently sidelined with a shoulder injury, while Samuela is set to begin the year playing on an edge.
Outside the Fainu brothers, Jeral Skelton is the only other obvious first-grader whose Tigers contract runs out after this season.