Could this be something like the Arnav [FONT="]Dhawan case? Arnav[/FONT] had some sort of medical emergency while the father was out of the country and the mother didn't call 911(maybe scared to without permission). The child ended up passing away and the father was the one to call 911 after he returned home, but it was way too late. That case ended in murder-suicide of the parents later, instead of one covering for the other though.
Could it be something similar though, where something happened while the father wasn't home(medical emergency, she wandered off, was taken, etc) and the mother was too scared to call for help without the fathers permission and he is covering for her now(either by getting rid of a body or just by making up a crazy story to keep the mother out of trouble)?