The relatives, aged between 40 and 75, were first degree relatives of Alzheimer's patients.

BBC: Genetic clue to Alzheimer's risk

The fifth question asks how many first-degree relatives your mother, sisters or daughters have had the disease.

NPR: Online Calculator Estimates Breast Cancer Risk

Have any of your child's first-degree relatives such as a parent or sibling been diagnosed with Angelman syndrome?

CNN: Angelman syndrome

De Magistris L, Familiari V, Pascotto A, et al. Alterations of the intestinal barrier in patients with autism spectrum disorders and in their first-degree relatives.

FORBES: Anti-Vaccine Activists Apparently Immune To Science

And, while rates of obesity dropped substantially between first and second degree relatives of obese patients without the gene mutations, this was far less obvious among relatives of those who were carriers.

BBC: NEWS | Health | Faulty gene link to obesity risk