Where is the crew?
This hypothesis is hardly a good use of my time but I watched this with my son last night and was curious about further details on the film. In the synopsis the writer suggests that the film glosses over the death of the crew. Based on information from the film (not the original novel) I must disagree.
While they may, in reality, have died in the stormy seas it seems unlikely that they died when the ship wrecked on the reef itself because:
A. The dialogue from Father suggests that they were abandoned and is supported by Ernst's anecdote that the Captain and First Mate were aware that the ship was in trouble. Disney doesn't usually trade in intentional subtlety so it seems unlikely that Father is trying to placate his family's emotions about the death of the crew by diverting them into believing they've been abandoned. (Some solution - what sort of guy would do that to his family?!)
B. There are no lifeboats or similar vessel after the crash. Lifeboats would have been a necessity to ferry the crew to shallows during the voyage. While a secondary boat could have realistically been destroyed in the shipwreck the probability is that any lifeboat is already gone when the family starts to consider creating the raft as an option to escape the ship. (Or they are really over-thinking their situation and avoiding the obvious...) The greater likelihood is that the gutless crew has taken any lifeboat, abandoned the family (to the storm and pirates) and attempted to save themselves.
If my memory of maritime fiction serves me correctly, no dead albatross goes unpunished so I have to imagine that the crew's salvation is short-lived and they eventually suffer a pretty grisly fate, anyway. (Although probably not as grisly as getting a homemade coconut bomb thrown in your face!)