NATIONAL LAMPOON'S RV VACATION
This movie is PRACTICALLY a Vacation movie complete with all the mishaps, kids coming along reluctantly against their own will,etc. Just replace Robin Williams and Cheryl Hine with Chevy Chase and Beverly D'Angelo as Clark and Ellen Griswold. Just change the names of the kids from Cassie and Carl to Audrey and Rusty. Just replace Jeff Daniels and his family with Randy Quaid as Cousin Eddie and his family. Then have the song "Holiday Road" playing in the background while they're riding in the RV. AND you got yourself:
NATIONAL LAMPOON'S RV VACATION...
It's all been done
It's all been done
It's all been done before...