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While doing some digging, I discovered that Willow Davis Roberts had went to a vacation spot where there was another family they were good friends with. 

That is pretty much the exact scenario in Twisted Summer where the protagonist's family travels to a lake every summer where a bunch of friendly families are.

IRL INFLUENCE DETECTED!!!

Oh yeah, here's my source: https://www.encyclopedia.com/people/social-sciences-and-law/political-science-biographies/willo-davis-roberts