First, descendants of people with AD more often have a higher genetic predisposition for AD (eg, carrier of the apolipoprotein E (APOE) ε4 allele).9 Second, high blood pressure, vascular diseases and other vascular risk factors (ie, diabetes type 2, obesity, hypercholesterolemia) often cluster in families.10 Lastly, psychosocial behaviour runs in the family and also affects health behaviour and lifestyle.11 12 Not surprisingly, individuals with a parent who is recently diagnosed with AD or VD often worry about their own risk of developing dementia. This evidence concerns the gene APOE and dementia.