Final answer:
The false statement about dementia is that it has a sudden onset; it actually develops gradually. There are indeed multiple types of dementia, falls can be a consequence, and family history is a known risk factor.
Step-by-step explanation:
The statement regarding dementia that is false is: It has a sudden onset. Dementia typically develops gradually and worsens over time. On the other hand, it is true that there are multiple types of dementia, with Alzheimer's disease being the most common one. Additionally, one of the consequences of dementia can be an increased risk of falls, due to issues with balance, coordination, and cognitive impairment.
Furthermore, family history is indeed a risk factor for developing dementia, including Alzheimer's disease, where genetics can play a role. For example, mutations in specific genes such as apolipoprotein E (APOE), particularly the E4 variant, have been associated with an increased risk of developing Alzheimer's.