. >> dr michael schneider used the californian database to investigate childhood disease. >> all of us have diseases that one in the family. we hope to predict that. you need data from a lot of people to understand that. >> he says my kids stand to benefit more from being part of the database than they would otherwise said. >> from people that have the diseases. privacy. they care at some level, but the child. >> reporter: the programme allows me as a personality to have the kids' data destroyed. researchers hope it will not do that. the code of our bodies can help bring more healthy children into the world. >> jake joins me, are privacy advocates going too mar. is there really a chance it will be connected to a person? >> we are living in a time when we have not yet seen anyone do anything nefarious with d.n.a. information. back in 2013, a group of researchers came up with a product where they reversed d.n.a. and link it to individuals. they took five donors much d.n.a., and came up with not just their names, but 45 connected. there are ways to reverse identify people. what kind of ne