It’s the first time the jury has been given insight into the life of Hamza, who alongside Ahmed Mohamed, 25, and Abdullah Chaarani, 27, is on trial for allegedly conspiring with prosecution witness Ibrahim Abbas, 24, to target landmarks across Melbourne's CBD in late 2016.

The jury heard Hamza is 14 months younger than Ibrahim and finds it hard to concentrate on anything other than computer games.

He’d previously struggled to learn Arabic and despite pressure from his brother did not want a wife, instead choosing to live with his mother, the court heard.

Ibrahim told the court his brother “tagged along” with him during the period in which the attack was allegedly planned because he couldn’t leave him alone with his wife for cultural reasons.

On Wednesday the jury deliberating over the case also heard secret jail cell recordings and phone taps prosecutors say prove the trio was in on a conspiracy to commit a terrorist attack.