SapphireSteel
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It's actually pretty common for parents in such cases to either fail or get an inconclusive on a polygraph. The closer the person is to the victim, the more apt they are to show false deception (meaning that the person is factually innocent but the polygraph shows deception):
http://findthekids.org/pdf/casemanag.pdf
Considering that, I don't find it too odd that one or more family members showed deception on the polygraph. Statistically, close to 1 in 5 families members do. In a close extended family like the Cook/Collins/Morrissey clan, it's likely more than one will show false deception.
With due respect, the source you quoted is dated 1997.
I'm no expert but I would imagine that LDT's have advanced in the last 15 years, both in technology and interpretation.
:moo: