"There's going to be voice-overs, sound effects and even a scene where a tank gets blown up," said Jarrah.
In Crete, the Allied forces suffered a heavy defeat. Over 3500 men were killed and 15,000 captured.
Nearly 700 New Zealand soldiers died, 1000 were wounded and 2200 taken prisoner during the battle.
Anzac Day is big for the Swift family, from Belmont on the North Shore, and all three boys have not missed an Anzac service since they were born.
Mother Glenda Kane, who authored a children's book, Anzac Day Parade, in 2010, says the Lego battle scene project was one way to "keep Anzac Day real" for her boys.
She says they have not done any research on Grand-uncle Tommy, who is a relative on her husband's side, but is happy for her children to think of him as a hero.
"Unlike some other kids who have granddads or grand-uncles here who have fought in the war, Uncle Tommy is the closest they will ever get to having an Anzac hero," she said. "Uncle Tommy personifies Anzac Day for them."
The Auckland Museum has the official Book of Remembrance open again this year for the public to post messages during the ANZAC period.
The public can also download the Dawn Service programme here.