I'm sorry for your loss.
Several people mentioned trip insurance. Did your parents have trip insurance for the cruise? If so - most policies will cover the single supplement if one person in the cabin can't sail for a covered reason. Your dad would pay the single supplement - which is the base fare for the 2nd passenger, minus the taxes. When the cruise ends, he would file a claim with the insurance company to be reimbursed for the extra expense.
If your parents didn't have trip insurance, then your dad would pay what he expected to pay, but without the taxes for the 2nd passenger.
Several people mentioned trip insurance. Did your parents have trip insurance for the cruise? If so - most policies will cover the single supplement if one person in the cabin can't sail for a covered reason. Your dad would pay the single supplement - which is the base fare for the 2nd passenger, minus the taxes. When the cruise ends, he would file a claim with the insurance company to be reimbursed for the extra expense.
If your parents didn't have trip insurance, then your dad would pay what he expected to pay, but without the taxes for the 2nd passenger.
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