Why is it when an OP ask a question... the answers are all over the place (not so much in this particular thread).
The OP was asking, "Has anyone any experience with this? If so, when should I call the resort to let them know? Please advise."
The OP didn't ask our opinion about who's job it is to do what..  That is off topic.  Only the OP knows what's best because the OP knows the family.  Non of us are in a relationship with them.  Each family is different.   Whatever happens afterwards, good or bad, they will deal with it on their own.