United Kingdom, Aug. 29 -- Nick and Vanessa Lachey always try to present a "united" front to their children.

The loved-up couple have Phoenix, eight, Brooklyn, ten, and Camden, 12, together, and Nick has opened up about their approach to parenting.

The 51-year-old star - who has been married to Vanessa since 2011 - told People: "Dad's probably a little more stern when it comes to discipline, but Mom is as well when she has to be. I think we do flip-flop on that regard.

"It's important to be united. You never want your kids to be mad at one parent and then find reprieve with the other. You've got to be on the same page as parents and be consistent."

Nick believes children crave consistently in their life.

He reflected: "I think that's...