Phantom Phone Call: The Sodder Disappearances

On Christmas Eve 1945, a strange phone call began a series of events that lead to a fire destroying the Sodder residence, where the parents and 9 of 10 children slept. All but 5 of the children escaped with their lives, but the other bodies were never found. The Sodder family still, after almost 80s years believe the missing children are still alive. Years later, a piece of evidence proving their survival turns up, bringing up new questions. 

Who called that night and what lead to a mystery that no one has been able to solve?

https://en.wikipedia.org/wiki/Sodder_children_disappearance#External_links

https://charleyproject.org/case/jennie-irene-sodder