Wigan have signed former Burnley defender Steven Caldwell on a one-year contract and the Scotland international will join brother Gary at the club.
The 29 year-old, who was a free agent after leaving Turf Moor in the summer, has impressed manager Roberto Martinez after spending the last few weeks on trial with the Latics.
Having completed the paperwork Caldwell is available for tomorrow night's Carling Cup game at Hartlepool.
The Caldwells are not the first brothers to be at Wigan at the same time; Warren and Wayne Aspinall were there in the mid 1980s.
"Gary has of course told me what the club is like and how impressed he has been with the set up here and I am delighted to have sorted out my future now," said Steven, who played in Wigan's pre-season friendly against Dundee United earlier this month.
"I have already got to know the lads over the past few weeks and I can't wait to get started and fight for my place."
Martinez, who has appointed Gary as club captain, has been impressed by the elder Caldwell's attitude.
"We have seen what Steven is all about during his time here - a leader on and off the field and he is a great personality to have in the dressing room," said the Spaniard.
"He has shown real professionalism in his time with us and we are delighted to have him on board.
"He has good experience of the Premier League and has played in the Champions League and UEFA Cup, plus is a full Scotland international.
"He is a totally committed defender who will add fantastic competition to the squad."