Prop forward Jonathan Walker has ended his four-year stay with Castleford Tigers after signing for Hull Kingston Rovers on a three-year deal.
The 22-year-old Scotland international will join twin brother Adam at Rovers after an initial deal with Hull FC fell through.
Explaining his decision to join Rovers, he said: “I’ve wanted to play alongside my brother for a long time and he has told me a load of good things about Hull KR.
“I first heard of Hull KR’s interest a couple of months ago and spoke to my brother and Jake Webster about the club.
“They both had nothing but good things to say about the place and every time I spoke with Adam last season, all he talked about was how much he enjoys it at Hull KR.
“I’ve watched him progress, play plenty of minutes and really enjoy his rugby and it’s something which I aspire to as well.
“I’d been at Cas a long time but I didn’t feel my career was progressing as well as I wanted it to and I wasn’t enjoying it there.
“I bring a good level of aggression and work-rate. Hopefully I can impress the fans.”
Walker made 48 Super League appearances for the Tigers since his debut in 2010.