It was pretty clear that the victims were killed in their sleep by somebody who knew how to do that without waking them. One person with skills could have done that.
I have heard speculation that there may have been multiple perpetrators involved rather than a single person, but no solid indicators have been disclosed yet for either possibility. I tend to believe that it was a single person who did the killings. The perpetrator was almost certainly a male (or two men). They may have left DNA traces at the scene.
I can conjure up at least five different scenarios as to why the killings were done, but I haven't got strong indicators to prefer any of them. And the real story is more likely something I have yet to imagine.
I would bet that some of the other posters in this forum will call out the real story correctly, either with a good guess or good contacts. I hope the police catch the perpetrator(s).
Cops shoulda brought in a bloodhound coz them killers wuz soaked in blood. But they didn`t use a bloodhound coz they is kinda dumb ...Bloodhounds can track a blood scent for over 100 miles. source =
“Underdogs | The Bloodhound’s Amazing Sense of Smell” - PBShttps://www.pbs.org