The Young Hollywood Studio welcomes the little Big Three of "This Is Us", Mackenzie Hancsicsak, Lonnie Chavis, and Parker Bates, who play the 10-year-old versions of Chrissy Metz, Sterling K. Brown, & Justin Hartley's characters (respectively) on the hit NBC show! The kids tell us when they first found out about That Huge Spoiler, plus they reveal the advice they received from their on-screen parents, Mandy Moore and Milo Ventimiglia!