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http://www.alzscot.org/pages/info/alzheimers.htm
There are some very rare families who have hereditary Alzheimer’s disease which is passed from an affected parent to roughly half their children, over many generations. It is important to stress that this only occurs in early onset dementia (where people develop the disease before the age of 65). It is extremely uncommon, in fact less than 5% of all people with Alzheimer’s disease. These families pass the illness through a faulty gene which causes a pathological form of the normal nerve cell chemicals. This kind of inherited Alzheimer’s disease is only likely to be the cause in families where at least three people have developed Alzheimer’s disease before 65 and at around the same age as each other. If this is the case in your family, you can talk to your GP about whether genetic testing is appropriate.
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