It's in my family, too. Sadly, no therapies exist that are able to even slow the disease, let alone halt or reverse it. And a lot of the recent imaging evidence is pointing to the changes building up a decade before any sort of cognitive changes. Even at a research level, it's a field with only a basic grasp of the disease and even more immature tools for studying it. Hopefully that'll change in the next decade... on the plus side, it's basically the core of neurodegenerative research. My feed pulls up 200-300 papers published per week on Alzheimer's, and it looks like people are starting to catch on to the more successful techniques that have come out of the cancer funding bonanza.
There are many topics that I have yet to dive into, environmental risk factors would be one of them. Another up there is its weird association with diabetes. I'll poke you if I get around to reading on the topic in the future. Right now I'm mostly looking at genetic associations and biochemical pathways.