The Griswold family home just got a lot more chaotic during the Christmas season. The In-Laws have moved in for the holiday, and Clark (Chevy Chase) & Russell (Johnny Galecki) are committed to spending the holiday outside making the house festive. Now all that matters is putting up the Christmas lights safely. Right? Watch National Lampoon’s Christmas Vacation (1989) on TNT. #TNT #NationalLampoonsChristmasVacation #ChevyChase #JohnnyGalecki SUBSCRIBE: bit.ly/SubscribeTNT Download the TNT App: bit.ly/1GcZDJb About TNT: The home of AEW, NBA on TNT, Rich & Shameless, Supernatural, The Lazarus Project, sports coverage and more. Connect with TNT Online: Visit the TNT WEBSITE: TNTDrama.com Like TNT on FACEBOOK: Facebook.com/TNTDrama Follow TNT on TikTok: tiktok.com/@tntnetwork Follow TNT on X (formerly TWITTER): X.com/TNTDrama Follow TNT on INSTAGRAM: Instagram.com/TNTDrama The In-Laws Show Up For Christmas [CLIP] | Nation...