Here's How Hereditary Alzheimer's Is, And It's Actually Quite Reassuring

Well this is a little encouraging:

“Nonetheless, they state that even those with two sets of APOE4 genes from both parents may never develop the condition. “Late-onset Alzheimer’s is not directly inherited through faulty genes,” they end.”

https://www.huffingtonpost.co.uk/entry/how-hereditary-is-alzheimers_uk_6666c446e4b0a01ba85b71f2