We’ve finally been treated to a nice look at “Twilight” star Taylor Lautner filming the Adam Sandler movie “Grown Ups 2.” Lautner was on set over the weekend with Arnold Schwarzenegger’s son Patrick (above left, with Lautner). Patrick, of course, spent his July Fourth in Hyannis Port with Lautner’s ex, Taylor Swift. It’s hard to keep track of these kids, right? Lautner plays a frat guy in Sandler’s sequel, which is filming around Marblehead and Swampscott. Lautner was at Fenway Park on Saturday night for the game. His “Grown Ups 2” costars Alexander Ludwig and David Spade — who play father and son in the film — stopped by Fenway on Sunday.