Neil Patrick Harris explains why he doesn’t want to know which twin is biologically his own

Neil Patrick Harris has spoken out about his children

"I have no interest in [finding out]. We are their parents and I love them implicitly," he said told Barbara Walters at the time.

"We inserted one of my sperm and one of David's sperm into two eggs with the hope that they would both take, just because we both wanted to be dads biologically," he said of the process.

"Both [eggs] took, miraculously," he added.

With Gideon and Harper now being in their teenage years, Harris opened up about how the family is navigating the transition.

"We keep being told that at a certain point, they're going to hate us," he joked in a recent interview with Entertainment Tonight.

"That hasn't happened yet. So you know, so far, so good!" 

"They're good kids. We've done a good job. You know, you put the work in and you get it back, you know?" Burtka added.