Family history is not necessary for an individual to develop Alzheimer’s. However, research shows that those who have a parent or sibling with Alzheimer's are more likely to develop the disease than those who do not have a first-degree relative with Alzheimer’s. Those who have more than one first-degree relative with Alzheimer’s are at an even higher risk. When diseases like Alzheimer's and other dementias tend to run in families, either genetics (hereditary factors), environmental factors — or both — may play a role.
So many people whose relatives have succumbed to this awful disease are living in fear of what might happen to them and my short term memory is shot to bits and I'm only 76.