Brin’s mother, Eugenia, has been diagnosed with Parkinson’s disease. In 2008, he decided to make a donation to the University of Maryland School of Medicine, where his mother is being treated.20 Brin used the services of 23andMe and discovered that although Parkinson’s is generally not hereditary, both he and his mother possess a mutation of the LRRK2 gene (G2019S) that puts the likelihood of his developing Parkinson’s in later years between 20 and 80%.6 When asked whether ignorance was not bliss in such matters, he stated that his knowledge means that he can now take measures to ward off the disease. An editorial in The Economist magazine states that "Mr Brin regards his mutation of LRRK2 as a bug in his personal code, and thus as no different from the bugs in computer code that Google’s engineers fix every day. By helping himself, he can therefore help others as well. He considers himself lucky. … But Mr. Brin was making a much bigger point. Isn’t knowledge always good, and certainly always better than ignorance?
The company (23andme) was co-founded by his (sergey) wife.
Disclosure: details taken from Wikipedia