Question: The Griswold family's vacation misadventures feature in both "Hotel Hell Vacation" and the "National Lampoon Vacation" series, as sanctioned by what company?
Sentence (from "Hotel Hell Vacation"): It was the first time Clark and Ellen had been seen in a "Vacation" film since 1997's "Vegas Vacation"; they later appeared together again in 2015's "Vacation".
Relevant evidence: No