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blackarcher256 The good news is, Alzheimers dementia cannot be genetically inherited if a person is over 60 years of age and has experienced no symptoms of dementia up to that point. In other words, if you can make it to 60, there is no chance that you'll possess the rare type of Alzheimer's gene that only affects those under the age of 60. This means that Alzheimers is not a genetic issue of itself, assuming that rare anomaly affecting those under 60 is not an issue either.
Vascular dementia cannot at all be genetically inherited from relatives. There is no genetic link between family members. Vascular dementia is caused by high blood pressure, diabetes, heart disease and stroke. Those 4 issues alone are caused from a poor or relatively unhealthy lifestyle one maintains their entire life which leads to those 4 issues over time, which then leads to vascular dementia in the end if they continue. This again is not a genetic issue but is definitely a lifestyle issue.
Hope this helps to relieve some of the fear that surrounds your family's experience with dementia. Feel free to contact me!