That doesn't sound right to me. How many professional killers in an international hit show up with an ax and leave with one of the victims still alive? If they wanted to leave a shocking and bloody message, there are other ways to do it once the intended victims are dead.
Nan, the children were all home, sleeping apparently, while the murders were done. The 10-year-old boy found the parents the next morning when their alarm went off and they did not wake up to turn it off.
Supposedly, there was blood in the bedroom of the oldest daughter (that I think she shared with a younger sister, maybe not), and the girl said it was from when she went to get the 3-year-old who was sleeping in the parents' room. Sounds a little fishy to me.