Genetics is the study of how a specific feature, such as a disease, is passed from one family generation to another. Researchers are working hard trying to learn the role of genetics in Alzheimer's disease. It's also a major concern for people with Alzheimer's disease and their families. However, note that sometimes people are concerned about a family history of Alzheimer's disease when, in fact, they have a family history of different dementia. So far, researchers have found over 20 genes that may increase the risk of developing Alzheimer's disease.