No one has found any connection between Duncan and the family - Shasta says they didn't know him. The sheriff says he randomaly picked out the family, but that he meticulously planned everything. (KREM article from 7/7)
The DNA tests on the body in the campground are still being done... in Quantico, VA.
Don't know if his mom could have done anything or not. The FBI is now looking at the disappearance of a five year old girl in Minnesota two years ago... Duncan's blog talks about it.(KREM article from 7/7)
Many thanks for the links!