Steven says it will be a “once-in-a-lifetime” moment if he does get to play against his twin.
But he has ruled out swapping shirts with Ryan at the end of the tie, which has to be decided on the day after replays from the first round onwards were scrapped.
“If I wanted his shirt I could just call him and get one sent over,” he laughs.
“Exchange shirts? I don’t think that’s going to happen.”
There is more than 200 miles of road between Wigan and Fulham, and Steven admits he misses his twin after spending so much of their youth together playing football.
“We know one another inside out,” he says.
“We speak a lot on the phone. He’s got a one-year-old daughter and I love being on the phone with her and him.”
Wigan boss Maloney said he would weigh up his options before deciding whether to play Steven following his recent injury.
In January, Peterborough boss Darren Ferguson came under fire from some fans after denying 18-year-old Tyler Young a chance to play against his dad, Ashley, when the Posh lost to Everton in the third round.
“We are not a charity case,” Ferguson, son of former Manchester United boss Sir Alex, said afterwards.
Maloney, part of the Wigan team that beat Manchester City in the 2013 FA Cup final, said: “I want to win.
“I know this game means a lot for those two [Steven and Ryan]. Sess is a brilliant guy who has worked extremely hard to get fit for this game.
“I’m pretty sure if we’re winning I’ll need Sess at some point so I hope he is on the pitch.”
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