Friends and relatives of the McStay family will gather Wednesday at the desert site near Victorville where the bodies of the mother and father were found, along with remains believed to be those of their children, to place memorial crosses and pay their respects.
Wednesday also marks the birthday of Joseph McStay, the father.
Authorities on Friday confirmed that the bodies of McStay, 42, and his wife, Summer, 45, had been positively identified after their remains were discovered. Two other sets of skeletal remains have not been positively identified, but are believed to be those of the couple's children, Gianni, 4, and Joseph Jr., 3.
The remains were found last week by a motorcyclist off-roading in the desert in San Bernardino County.
Authorities on Friday confirmed the deaths were being treated as homicides.
On a blog that had been dedicated to helping find the vanished family, Joseph McStay's brother, Mike, wrote Tuesday that he is "broken and grieving."
"For the last few days I’ve really been at a loss for words," he wrote. "I think most of the family members have been dealing with the shock of this, the best way we know how. I know that this is definitely true for myself."