By peoplestaff225
Updated January 12, 2009 03:00 PM

Look who’s smiling! The normally serious Alexander ‘Sasha’ Pete was clearly enjoying a lift from dad Liev Schreiber while out at the park over the weekend. The family, including mom Naomi Watts, returned to NYC on Monday after spending newborn Samuel Kai‘s first few weeks at their Hamptons home.

The playground playdate was nothing new for Liev, who recently shared that he enjoys acting silly with his 17 ½-month-old son. A favorite game is pseudo-hide-and-seek, whereby Sasha hides behind the arm of the couch and Liev pretends that he can’t see him. “I realize that there’s a kind of a divine Buddha truth in that. I should be doing more things where I’m pretending that I can’t see my son and making him laugh. That is for me is the brighter side of being a father, that there is something to be said for silliness. My son has given me that.”

Want to see more of this beautiful family? Check out our Watts-Schreiber Family Gallery!

Sasha wears a monkey scarf from Admiral Road ($15).

He also wears Stride Rite’s Retrograde sneaker ($20).