@Lee150
Contact AirBnB, and let them know what's going on. They will cancel for you. If you've already cancelled, they can help you recover the fees that you should not have been charged due to extenuating circumstances. You also have the opportunity to respond to any review. Simply cite that death in the family in your response. Potential future guests will understand, and that unfortunate cancellation note will move down in the reveiw pages to the point where it is no longer seen.
I'm sorry for your loss, and hope you're in better spirits soon.