The 23-year-old actor has two daughters - Wylda Rae, three, and 18-month-old Romy Hero - with wife Sam Taylor-Johnson, as well as two step-children from Sam's previous marriage, reported Contactmusic.
"The way I was brought up was to always be encouraged in doing what you love doing and having the opportunity to do that, and being honest. Being honest with your kids is most important really.
"They know when you're lying for sure. I learn more from my kids than anyone else ... They are incredibly smart and they're sweet," Johnson said.
"It's odd to play an adolescent teenage high school kid, and, you know, I'm married and I've got four kids essentially - four girls, two of which are stepdaughters. It's strange and odd but the challenge was to create that character and get into that headspace," he said.