Yes! Sarah's older brother Johnny was the real-life model for the kid in Jack Chick's "Big Daddy." As a grad student working on his thesis, he disappeared shortly after he intimated to her that startling facts were turning up in his researches about Piltdown Man. Was he getting too close to a prized secret guarded by a ruthless and desperate conspiracy? Sarah will never rest until she has the truth.
I see I'm going to have to trademark the PiltDown Conspiracy before Spielberg gets to it.