On Thanksgiving Day, 7-year-old Oliver Crowson, his parents, three siblings and grandmother will be six hours away from their Marietta, Ga., home. They will be in Jacksonville, at the soon-to-be expanded Ronald McDonald House, a free home for families of critically ill children receiving treatment at local hospitals. They will celebrate blessings they did not appreciate quite so much three months ago. That was when Oliver started having headaches and vomiting.