Per the Los Angeles Times: the bodies have been identified as the McStays. Or, rather, the adult skeletons have been identified as Joseph and Summer, and they’re assuming the child skeletons are of the two boys. Obviously, this was a homicide; dead people don’t bury themselves.
I don’t know what else to say, beyond that this is very, very sad. I mean, who massacres a whole family, including two children under five?
I really hope they find out who did this.