Help my sisters family with the mortgage

Hi im creating this fundraiser for my sister and her family.  Just over 12 months ago she went to the doctors with a mole that turned out to be malignant.  She had surgery to remove the mole and surrounding tissue. Fast forward 12 months and the cancer is back with a vengeance,  now stage 4. It has spread to the liver, lungs, chest, stomach and spine. We are praying that it hasnt gone to the brain.  She has now started targeted therapy and we are praying that this treatment works. Unfortunately they do not have critical illness cover on their mortgage and my sister has been unable to work for over 6 months.  We are trying to raise money to clear as much off the mortgage while she is undergoing treatment without the worry and struggle of paying the bills. Thankyou for any help you can provide.