An estate sale inside the house is dangerous- everyone who attended knows what is in the house, the ages of the people who live there, the layout of the house, had an opportunity to look around for what kind of pets might be there (i.e. evidence of aggressive dogs),could even have unlocked a window. The fact that the owners still live there means there was probably a wad of cash in the house, proceeds of the days sale.
That said, if they were selling all of their furniture, I can see why it would be easy to have the sale in the house. What a shame we have to be cynical in order to stay safe.
There was discussion earlier about how long the grandparents have been married. I think a long time- I dont think he is a step grand parent. I found an obit for KL's mother, where it is said she has one great grandson, Nathan, and lots of step great grandchildren. I guess that means that Nathans big brother has a different mother.
http://www.hffs.com/memsol.cgi?user_id=484442
What a nightmare for this poor family.