“””Smith also did not release the names of Joseph’s parents. Both parents are dead, he said.
“Joseph has a number of siblings on both the mother’s and father’s side who are living. And it is out of respect for them that their parents’ information remain confidential,” he explained.”””
It could be that Joseph’s siblings were not born or were too young to remember they had a brother Joseph.
It looks pretty sure the parents killed their son.
“”Joseph has a number of siblings on both the mother’s and father’s side.””
They apparently know who the mother was and that she married (or not) and had children with someone else - likewise the father. There wouldn’t be any reason to use the term - “both mother’s and father’s side” otherwise. Just “siblings” would have been sufficient.
How horribly sad. Someone, somewhere in a neighborhood, had to know a child had gone missing..