The actor revealed on The Wendy Williams Show that the personalities of his children, Gideon and Harper, are telling of their biological parentage

Now that David Burtka‘s children with Neil Patrick Harris are getting older, he has a pretty good idea which of the fraternal twins is biologically his.

The actor stopped by The Wendy Williams Show on Thursday and revealed that the answer is all in their personalities.

Burtka, 39, thinks that Harper Grace might be biologically his because, as he put it, “She’s like, ‘Hey everybody, I’m here!’ ”

Meanwhile, Gideon Scott is likely Harris’, says Burtka, because “He’s a little more heady and intellectual.”

Neil Patrick Harris David Burtka
Neil Patrick Harris and David Burtka with their children

The twins, now 4 years old, were born via surrogate.

“It’s a lot harder for gay guys [to have kids], although we tried!” Burtka joked to Wendy Williams, going on to explain that there were “two different women involved. There was an egg donor, a wonderful woman who was anonymous. We took two of our best guys and implanted them into her eggs, two different eggs.”

And then, of course, there was the surrogate who carried the babies to term, giving birth to Gideon and Harper in October 2010.

Their personalities are not only distinct from each other’s, but probably from most preschoolers, as well. Burtka recently told The New Potato that his kids have “incredible palates.”

“Gideon eats everything you put in front of him,” said Burtka. “His passion for cooking and eating good food is in his soul,” adding that his son loves “clams, sushi, octopus, grilled pork, steak, parmigiana cheese, ginger, mint, cinnamon and coconut.”

As for Harper, Burtka says she likes “briny flavors” and particularly enjoys “oysters, sardines, prosciutto, capers, duck liver, miso, and anything chocolate.”

— Amanda Michelle Steiner