WHO is the "family member" who was supposed to pick them up? If it was a parent why not say mom or dad was supposed to pick them up or grandma or grandpa....my first thought and first puzzle is with this family member.........
Noodling around on Facebook, there are some complicated relationships. I think it's a privacy thing - and with the FBI now involved, if by chance the family member was somehow involved, that will come out. I really doubt it.