Win or lose, the brothers are already thinking of the future with Niall pondering a move to England's colours just like Ed Joyce, the batsman whose runs helped Ireland make the trip to the Caribbean in the first place.
Joyce is tipped to open the batting for England in the tournament
"I'd like to follow Joycey. It's a good time to be a keeper in England," said Niall, at 25, the older of the two brothers by three years.
Niall will play the next English county season with Northants after spending two years at Kent as England international Geraint Jones's understudy.
"When Geraint lost his place on the England team, it meant Kent couldn't afford the two of us. I wasn't really surprised, I got lots of chances but never got enough runs," added Niall.
"I'm really looking forward to establishing myself at Northampton. It's not like Kent where I was always going to be number two. I can play for my place. It's great to get a second chance."
With Zimbabwe coming into the tournament in a state of chaos, Ireland fancy their chances of a winning Group D start before taking on heavyweights Pakistan and West Indies.
The Irish don't lack for confidence.
In a World Cup warm-up match last week they reduced world number one South Africa to 92-8 at one stage before going down to a narrow defeat.
"We'll probably be favourites to beat Zimbabwe - that game is there for the taking," said Niall.
"If we bat first we've got to get a competitive score. If we bowl first we're confident we can chase anything down."
Ireland have already defeated the West Indies in Belfast in 2004 with Niall even having a run-in with Brian Lara.
"Lara was funny," Niall told the Irish Times.
"We had that disagreement in that match and then two days later I turned up to play against him for Kent. I don't think he could believe his eyes. I think he'd seen enough of me!
"I talked to Dwayne Bravo recently and he said 'Brian said to say hello!' I'm looking forward to seeing him in Jamaica."
All-rounder Kevin cut his teeth by spending two years on the staff at Lord's with MCC Young Cricketers.
"It was a brilliant experience," says Kevin. "It was a great set-up, very well-organised and great cricket on great wickets. My game went forward a huge amount in those two years."
Ireland also have another set of brothers in the squad, John and Paul Mooney. John has also played against the West Indies taking three wickets in a match three years ago.
Zimbabwe (from): Prosper Utseya (captain), Gary Brent, Justice Chibhabha, Elton Chigumbura, Keith Dabengwa, Terry Duffin, Anthony Ireland, Friday Kasteni, Stuart Matsikenyeri, Christopher Mpofu, Tawanda Mupariwa, Edward Rainsford, Vusimuzi Sibanda, Brendon Taylor, Sean Williams.
Ireland (from): Trent Johnson (captain), Andre Botha, Jeremy Bray, Kenny Carroll, Peter Gillespie, Dave Langford-Smith, Kyle McCallan, John Mooney, Paul Mooney, Eoin Morgan, Kevin O'Brien, Niall O'Brien, William Porterfield, Boyd Rankin, Andrew White.
Umpires: Brian Jerling (RSA) and Ian Gould (ENG). TV Replays: Billy Bowden (NZL), Reserve: Simon Taufel (AUS).
Match referee: Roshan Mahanama (SRI)
Weather: Chance of showers. High temperatures in the upper 80s, and low temperatures in the upper 70s.
Pitch: Provided early bounce and movement to seam bowlers in the opening match between West Indies and Pakistan, but it gradually played true once the preparation moisture evaporated.