Upsetting news during this time of joy

My young cousin was admitted into Primary Children's last Thursday. His name is Luke and he is such an amazing and sweet little guy. On Thursday he came home from school and told his mom that he couldn't see out of one eye. She took him to his doctor who sent them up to the hospital. He has been there for 4 days now. They have run all kinds of tests. They have done blood work and an MRI, a CAT scan, a spinal tap, and they can not find out what is wrong. They have thrown out suggestions such as, a brain tumor, M.S., an immune problem, a brain injury from a fall, and several others. They are not sure he is going to be home for Christmas or if he is going to have to spend it in the hospital, but I would like to ask you all to keep him and his family in your prayers. I just hope that they can all spend Christmas at home together as a family. They really truly need and deserve that this year especially. It has been a really tough year for this wonderful little family. I love you Lukey!