You'll have to personally confront the teacher and give the greatest sob story ever, I'm serious. A buddy of mine convinced his teacher that he was missing class to tend to his cancer ridden mom. He even faked paper work to pull it off.
If you're gonna do it, you have to do it WELL. Deaths in family is the ultimate no no because it can be traced; any compotent teacher has heard that excuse a billion times and will want something from the funeral as evidence. Therefore an illness is the best thing to fake. I wouldn't try my friend's "cancer mom" trick; instead use it on a young sibling. Its easier to fake the illness of a minor than an adult