Researchers found that individuals with at least two first-degree relatives with Alzheimer’s disease had 3.98 times higher odds of developing Alzheimer’s, compared with those without family history, while those with at least three affected second-degree relatives and those with one first-degree relative and two second-degree relatives with Alzheimer’s were 2.46 times and 21.29 times more likely to develop the disease, respectively. The findings also showed a 1.43 times increased likelihood of Alzheimer’s among those with at least three affected third-degree relatives, compared with those without any family history.