Hi kanedenmk

I am sorry to read about your sister.

The causes of Lewy Body Dementia are not well-understood though the biggest risk factor is age; it usually affects people who are over 50. There are some genetic risk factors but these only apply in a very small number of cases. What that means is that it is very likely that the chances of you getting Lewy Body Dementia are no greater than for anybody else.

The information here might help you Lewy Body Dementia: Information for Patients, Families, and Professionals | National Institute on Aging.

All the best.