The Block NZ's Amy & Stu shed tears over the show's biggest difficulty

'Gizzy Hard' team Amy and Stu may be the top team to beat on The Block NZ, but when they're not building, they're regular parents.

The couple are the only parents competing this season, and while styling a room each week is hard, it doesn't compare to what they've left behind.

Tearing up as they talk about their 12-year-old daughter still in Gisborne, Amy says being part of the reality TV series is hard for "different reasons".

"Being here isn't hard... What isn't here - that's the struggle."

"And if we can do that together well, then we can do this well."

Amy had cried in a previous episode when she was disappointed about a "surprise visitor" for Amy was not her daughter.

"I hope we made the right decision [being on The Block NZ]," she said at the time. 

"I think it will be the right decision in the long run," Stu reassured.