What is Sanfilippo syndrome?

Peek into the Moons' backyard, you'll see three happy children enjoying every ounce of this warm September day. What you can't see is that behind Jacob Moon's bright eyes and warm smile lingers a devastating illness that will, undoubtedly, claim his life. Jacob has an extremely rare illness called Sanfilippo syndrome, a neurologically degenerative, fatal disease that affects one in 70,000 kids.