I'm so sorry to hear that Josh's mom passed. Same thing happened to one of my dearest friends -- he arrived just after his mom passed -- almost as if she planned it that way.
Clearly Josh and his mom were very closely connected for him to have the intuition it was time to head up there -- and being there for his dad may actually have been the reason.
You will be of great comfort to Josh and his family -- you're a wonderful person to have on anyone's side!